diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 57405046..49d8cb7f 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -13,6 +13,7 @@ import itertools
 from bokeh.plotting import figure, ColumnDataSource, Figure,curdoc
 from bokeh.models import CustomJS,Slider, TextInput,BoxAnnotation
 from bokeh.charts import Histogram,HeatMap,Area,BoxPlot,Bar
+from bokeh.charts.attributes import CatAttr
 from bokeh.resources import CDN,INLINE
 from bokeh.embed import components
 from bokeh.layouts import layout,widgetbox
@@ -227,6 +228,7 @@ def interactive_activitychart(workouts,startdate,enddate,stack='type'):
         return "",""
     
     dates = []
+    dates_sorting = []
     types = []
     rowers = []
     durations = []
@@ -234,8 +236,10 @@ def interactive_activitychart(workouts,startdate,enddate,stack='type'):
     for w in workouts:
         if w.privacy == 'visible':
             dd = w.date.strftime('%m/%d')
+            dd2 = w.date.strftime('%Y/%m/%d')
             du = w.duration.hour*60+w.duration.minute
             dates.append(dd)
+            dates_sorting.append(dd2)
             durations.append(du)
             types.append(w.workouttype)
             try:
@@ -253,9 +257,10 @@ def interactive_activitychart(workouts,startdate,enddate,stack='type'):
     except ValueError:
         pass
 
-        
+    # add dates with no activity
     while d<=enddate:
         dates.append(d.strftime('%m/%d'))
+        dates_sorting.append(d.strftime('%Y/%m/%d'))
         durations.append(0)
         types.append('rower')
         rowers.append('Sander')
@@ -263,12 +268,19 @@ def interactive_activitychart(workouts,startdate,enddate,stack='type'):
                      
     df = pd.DataFrame({
         'date':dates,
+        'date_sorting':dates_sorting,
         'duration':durations,
         'type':types,
         'rower':rowers,
         })
+
+    df.sort_values('date_sorting',inplace=True)
                       
-    p = Bar(df,'date',values='duration',title='Activity',
+    p = Bar(df,values='duration',
+            label = CatAttr(columns=['date'], sort=False),
+            xlabel='Date',
+            ylabel='Time',
+            title='Activity',            
             stack=stack,
     	    plot_width=350,
 	    plot_height=250,
diff --git a/rowers/metrics.py b/rowers/metrics.py
index 72d2d1bb..b2f3eaa6 100644
--- a/rowers/metrics.py
+++ b/rowers/metrics.py
@@ -354,14 +354,21 @@ def getagegrouprecord(age,sex='male',weightcategory='hwt',
 
         p0 = [700,120,700,10,100,100]
 
-        p1, success = optimize.leastsq(errfunc,p0[:],
+        try:
+            p1, success = optimize.leastsq(errfunc,p0[:],
                                        args = (ages,powers))
+        except:
+            p1 = p0
+            success = 0
 
-        power = fitfunc(p1, float(age))
+        if success:
+            power = fitfunc(p1, float(age))
 
-        #power = np.polyval(poly_coefficients,age)
+            #power = np.polyval(poly_coefficients,age)
 
-        power = 0.5*(np.abs(power)+power)
+            power = 0.5*(np.abs(power)+power)
+        else:
+            power = 0
     else:
         power = 0
 
diff --git a/rowers/tasks.py b/rowers/tasks.py
index f17fb216..a89377de 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -66,7 +66,10 @@ def long_test_task2(self,aantal,**kwargs):
     kwargs['jobid'] = job_id
         
     return longtask.longtask2(aantal,**kwargs)
+
+
     
+
 # create workout
 @app.task
 def handle_new_workout_from_file(r, f2,
diff --git a/rowers/templates/rankings.html b/rowers/templates/rankings.html
index ee6fc209..6c0b0b6a 100644
--- a/rowers/templates/rankings.html
+++ b/rowers/templates/rankings.html
@@ -5,6 +5,25 @@
 {% block title %}Workouts{% endblock %}
 {% block scripts %}
 {% include "monitorjobs.html" %}
+<script type='text/javascript'
+        src='https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js'>
+</script>
+
+<script>
+  $(function($) {
+  console.log('loading script');
+  console.log('{{ recalc }}');
+  if ('{{ recalc }}' == 'True') {
+  theurl = '/rowers/ajax_agegroup/{{ age }}/{{ weightcategory }}/{{ sex }}/{{ user.id }}'
+    console.log(theurl);
+    $.getJSON(window.location.protocol + '//'+window.location.host + theurl, function(json) {
+  location.reload();
+  });
+  } else {
+  console.log('No need to reload');
+  }
+  });
+</script>
 {% endblock %}
 
 {% block content %}
diff --git a/rowers/urls.py b/rowers/urls.py
index 7c5b3679..7d345028 100644
--- a/rowers/urls.py
+++ b/rowers/urls.py
@@ -123,6 +123,8 @@ urlpatterns = [
     url(r'^imports/$', TemplateView.as_view(template_name='imports.html'), name='imports'),
     url(r'^agegroupcp/(?P<age>\d+)$',views.agegroupcpview),
     url(r'^agegroupcp/(?P<age>\d+)/(?P<normalize>\d+)$',views.agegroupcpview),
+    url(r'^ajax_agegroup/(?P<age>\d+)/(?P<weightcategory>\w+.*)/(?P<sex>\w+.*)/(?P<userid>\d+)$',
+        views.ajax_agegrouprecords),
     url(r'^agegrouprecords/(?P<sex>\w+.*)/(?P<weightcategory>\w+.*)/(?P<distance>\d+)m$',
         views.agegrouprecordview),
     url(r'^agegrouprecords/(?P<sex>\w+.*)/(?P<weightcategory>\w+.*)/(?P<duration>\d+)min$',
diff --git a/rowers/views.py b/rowers/views.py
index dca8b0a2..5364fbdc 100644
--- a/rowers/views.py
+++ b/rowers/views.py
@@ -2957,9 +2957,15 @@ def histo(request,theuser=0,
     if 'options' in request.session:
         options = request.session['options']
 
-    workouttypes = options['workouttypes']
-    includereststrokes = options['includereststrokes']
-    waterboattype = options['waterboattype']
+    try:
+        workouttypes = options['workouttypes']
+        includereststrokes = options['includereststrokes']
+        waterboattype = options['waterboattype']
+    except KeyError:
+        workouttypes = ['water','rower','dynamic','slides']
+        waterboattype = ['1x','2x','2-','4x','4-','8+']
+        includereststrokes = False
+        
     workstrokesonly = not includereststrokes
 
 
@@ -3509,6 +3515,66 @@ def rankings_view(request,theuser=0,
                    'teams':get_my_teams(request.user),
 		   })
 
+@login_required()
+def ajax_agegrouprecords(request,
+                         age=25,
+                         sex='female',
+                         weightcategory='hwt',
+                         userid=0):
+    
+    wcdurations = []
+    wcpower = []
+    durations = [1,4,30,60]
+    distances = [100,500,1000,2000,5000,6000,10000,21097,42195]
+    for distance in distances:
+        worldclasspower = metrics.getagegrouprecord(
+            age,
+            sex=sex,
+            distance=distance,
+            weightcategory=weightcategory
+        )
+        velo = (worldclasspower/2.8)**(1./3.)
+        try:
+            duration = distance/velo
+            wcdurations.append(duration)
+            wcpower.append(worldclasspower)
+        except ZeroDivisionError:
+            pass
+        for duration in durations:
+            worldclasspower = metrics.getagegrouprecord(
+                age,
+                sex=sex,
+                duration=duration,
+                weightcategory=weightcategory
+            )
+            try:
+                velo = (worldclasspower/2.8)**(1./3.)
+                distance = int(60*duration*velo)
+                wcdurations.append(60.*duration)
+                wcpower.append(worldclasspower)
+            except ValueError:
+                pass
+
+    options = {}
+    options['wcpower'] = wcpower
+    options['wcdurations'] = wcdurations
+
+    thenowtime = timezone.now().isoformat()
+    options['lastupdated'] = thenowtime
+    options['userid'] = userid
+    
+    request.session['options'] = options
+    
+            
+    return JSONResponse(
+        {
+        'wcdurations': wcdurations,
+            'wcpower': wcpower,
+            'lastupdated': thenowtime,
+            }
+        )
+
+
 # Show ranking distances including predicted paces
 @login_required()
 def rankings_view2(request,theuser=0,
@@ -3534,48 +3600,60 @@ def rankings_view2(request,theuser=0,
 
     if theuser == 0:
 	theuser = request.user.id
+    else:
+        lastupdated = "01-01-1900"
 
+        
     promember=0
     if not request.user.is_anonymous():
-	r = getrower(request.user)
+        r = getrower(theuser)
         wcdurations = []
         wcpower = []
         
+        lastupdated = "01-01-1900"
+        userid = 0
+        if 'options' in request.session:
+            options = request.session['options']
+            try:
+                wcdurations = options['wcdurations']
+                wcpower = options['wcpower']
+                lastupdated = options['lastupdated']
+            except KeyError:
+                pass
+            try:
+                userid = options['userid']
+            except KeyError:
+                userid = 0
+        else:
+            options = {}
+
+            
+
+        lastupdatedtime = arrow.get(lastupdated).timestamp
+        current_time = arrow.utcnow().timestamp
+
+        deltatime_seconds = current_time - lastupdatedtime
+        recalc = False
+        if str(userid) != str(theuser) or deltatime_seconds > 3600:
+            recalc = True
+        else:
+            recalc = False
+
+        options['userid'] = theuser
+        
         if r.birthdate:
-            age = calculate_age(r.birthdate)
-            durations = [1,4,30,60]
-            distances = [100,500,1000,2000,5000,6000,10000,21097,42195]
-            for distance in distances:
-                worldclasspower = metrics.getagegrouprecord(
-                    age,
-                    sex=r.sex,
-                    distance=distance,
-                    weightcategory=r.weightcategory
-                )
-                velo = (worldclasspower/2.8)**(1./3.)
-                try:
-                    duration = distance/velo
-                    wcdurations.append(duration)
-                    wcpower.append(worldclasspower)
-                except ZeroDivisionError:
-                    pass
-            for duration in durations:
-                worldclasspower = metrics.getagegrouprecord(
-                    age,
-                    sex=r.sex,
-                    duration=duration,
-                    weightcategory=r.weightcategory
-                    )
-                try:
-                    velo = (worldclasspower/2.8)**(1./3.)
-                    distance = int(60*duration*velo)
-                    wcdurations.append(60.*duration)
-                    wcpower.append(worldclasspower)
-                except ValueError:
-                    pass
+            age = calculate_age(r.birthdate)            
         else:
             worldclasspower = None
             age = 0
+
+        options['wcpower'] = wcpower
+        options['wcdurations'] = wcdurations
+        if theuser:
+            options['userid'] = theuser
+
+        request.session['options'] = options
+
             
 	result = request.user.is_authenticated() and ispromember(request.user)
 	if result:
@@ -3852,6 +3930,7 @@ def rankings_view2(request,theuser=0,
 		   'theuser':uu,
                    'age':age,
                    'sex':r.sex,
+                   'recalc':recalc,
                    'weightcategory':r.weightcategory,
 		   'startdate':startdate,
 		   'enddate':enddate,
@@ -5687,15 +5766,25 @@ def boxplot_view_data(request,userid=0,
 
     if 'options' in request.session:
         options = request.session['options']
-        
-    includereststrokes = options['includereststrokes']
-    spmmin = options['spmmin']
-    spmmax = options['spmmax']
-    workmin = options['workmin']
-    workmax = options['workmax']
-    ids = options['ids']
-    userid = options['userid']
-    plotfield = options['plotfield']
+
+    try:
+        includereststrokes = options['includereststrokes']
+        spmmin = options['spmmin']
+        spmmax = options['spmmax']
+        workmin = options['workmin']
+        workmax = options['workmax']
+        ids = options['ids']
+        userid = options['userid']
+        plotfield = options['plotfield']
+    except KeyError:
+        includereststrokes = False
+        spmmin = 15
+        spmmax = 55
+        workmin = 0
+        workmax = 55
+        ids = []
+        userid = 0
+        plotfield = 'spm'
 
     
     workstrokesonly = not includereststrokes
@@ -5767,8 +5856,13 @@ def boxplot_view(request,userid=0,
 
     if 'options' in request.session:
         options = request.session['options']
+
+    try:
+        includereststrokes = options['includereststrokes']
+    except KeyError:
+        includereststrokes = False
+        options['includereststrokes'] = False
         
-    includereststrokes = options['includereststrokes']
     workstrokesonly = not includereststrokes
 
     if userid==0:
@@ -5887,7 +5981,6 @@ def workouts_view(request,message='',successmessage='',
     except ValueError:
         activity_enddate = enddate
 
-        
     if teamid:
         try:
             theteam = Team.objects.get(id=teamid)
@@ -5954,7 +6047,7 @@ def workouts_view(request,message='',successmessage='',
         stack='rower'
     else:
         stack='type'
-        
+
     script,div = interactive_activitychart(g_workouts,
                                            activity_startdate,
                                            activity_enddate,