Ahh, thanks a lot for that info Mike.
I tried resetting the measure symbols:
MeasureAction.FillSymbol = MeasureFillSymbol;
MeasureAction.LineSymbol = MeasureLineSymbol;
But guess there is still something else going on, hence your suggestion to use the geodesic operations. I think I will just turn off the accellerated display mode for now and eagerly await the release of 10.2.1.
Thanks again Mike!