diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index cd1eaec5..f6eaaba1 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -263,6 +263,12 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
         pass
 
 
+    # protect 0 spm values from being nulled
+    try:
+        datadf['spm'] = datadf['spm'] + 1.0
+    except TypeError:
+        pass
+        
     try:
         datadf = datadf.clip(lower=0)
     except TypeError:
@@ -270,6 +276,11 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
 
     datadf.replace(to_replace=0, value=np.nan, inplace=True)
 
+    # bring spm back to real values
+    try:
+        datadf['spm'] = datadf['spm'] - 1
+    except TypeError:
+        pass
 
     # return from positive domain to negative
     try:
@@ -295,6 +306,12 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
         except KeyError:
             pass
 
+    try:
+        mask = datadf['spm'] < 0
+        datadf.loc[mask,'spm'] = np.nan
+    except KeyError:
+        pass
+        
     try:
         mask = datadf['efficiency'] > 200.
         datadf.loc[mask, 'efficiency'] = np.nan
@@ -1614,6 +1631,7 @@ def getsmallrowdata_db(columns, ids=[], doclean=True, workstrokesonly=True):
     if doclean:
         data = clean_df_stats(data, ignorehr=True,
                               workstrokesonly=workstrokesonly)
+        data.dropna(inplace=True,axis=0)
 
     return data
 
diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 6b3ae2e4..f498fce3 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -2638,18 +2638,18 @@ def interactive_flex_chart2(id=0,promember=0,
         rowdata = dataprep.getsmallrowdata_db(columns,ids=[id],doclean=True,
                                               workstrokesonly=False)
         workstrokesonly=False
-        
     try:
         tests = rowdata[yparam2]
     except KeyError:
         yparam2 = 'None'
 
+
+        
     try:
         tests = rowdata[yparam1]
     except KeyError:
         yparam1 = 'None'
         
-    rowdata.dropna(axis=1,how='all',inplace=True)
 
     # test if we have drive energy
     nowork = 1
@@ -2670,7 +2670,7 @@ def interactive_flex_chart2(id=0,promember=0,
         
     row = Workout.objects.get(id=id)
     if rowdata.empty:
-	return "","No valid data"
+	return "","No valid data",'','',workstrokesonly
     else:
         try:
             rowdata.sort_values(by='time',ascending=True,inplace=True)
@@ -2690,7 +2690,7 @@ def interactive_flex_chart2(id=0,promember=0,
     try:
         tseconds = rowdata.ix[:,'time']
     except KeyError:
-        return '','No time data - cannot make flex plot','',''
+        return '','No time data - cannot make flex plot','','',workstrokesonly
 
     
     try:
@@ -3098,7 +3098,7 @@ def interactive_flex_chart2(id=0,promember=0,
 
     try:
         distmax = 100+100*int(rowdata['distance'].max()/100.)
-    except KeyError:
+    except (KeyError,ValueError):
         distmax = 100
         
     slider_dist_min = Slider(start=0,end=distmax,value=0,step=1,
diff --git a/rowers/utils.py b/rowers/utils.py
index 08f97d4b..003a41ab 100644
--- a/rowers/utils.py
+++ b/rowers/utils.py
@@ -326,7 +326,10 @@ def wavg(group, avg_name, weight_name):
     should return otherwise.
     """
     d = group[avg_name]
-    w = group[weight_name]
+    try:
+        w = group[weight_name]
+    except KeyError:
+        return d.mean()
     try:
         return (d * w).sum() / w.sum()
     except ZeroDivisionError:
diff --git a/rowers/views.py b/rowers/views.py
index 409ac0d5..ca375bb0 100644
--- a/rowers/views.py
+++ b/rowers/views.py
@@ -7446,7 +7446,6 @@ def workout_stats_view(request,id=0,message="",successmessage=""):
         return HttpResponseRedirect(url)
 
     datadf = dataprep.clean_df_stats(datadf,workstrokesonly=workstrokesonly)
-    datadf['deltat'] = datadf['time'].diff()
         
     if datadf.empty:
         datadf,row = dataprep.getrowdata_db(id=id)
@@ -7455,6 +7454,7 @@ def workout_stats_view(request,id=0,message="",successmessage=""):
         if datadf.empty:
             return HttpResponse("CSV data file not found")
 
+    datadf['deltat'] = datadf['time'].diff()
         
         
     workoutstateswork = [1,4,5,8,9,6,7]
@@ -8069,15 +8069,31 @@ def workout_flexchart3_view(request,*args,**kwargs):
 
     # create interactive plot
     try:
-        script,div,js_resources,css_resources,workstrokesonly = interactive_flex_chart2(id,xparam=xparam,yparam1=yparam1,
-		                                                                        yparam2=yparam2,
-				                                                        promember=promember,plottype=plottype,
-				                                                        workstrokesonly=workstrokesonly)
+        (
+            script,
+            div,
+            js_resources,
+            css_resources,
+            workstrokesonly
+        ) = interactive_flex_chart2(
+            id,xparam=xparam,yparam1=yparam1,
+	    yparam2=yparam2,
+	    promember=promember,plottype=plottype,
+            workstrokesonly=workstrokesonly
+        )
     except ValueError:
-        script,div = interactive_flex_chart2(id,xparam=xparam,yparam1=yparam1,
-				             yparam2=yparam2,
-				             promember=promember,plottype=plottype,
-				             workstrokesonly=workstrokesonly)
+        (
+            script,
+            div,
+            js_resources,
+            css_resources,
+            workstrokesonly
+        ) = interactive_flex_chart2(
+            id,xparam=xparam,yparam1=yparam1,
+	    yparam2=yparam2,
+	    promember=promember,plottype=plottype,
+	    workstrokesonly=workstrokesonly
+        )
         js_resources = ""
         css_resources = ""