After getting killed I got this error:
Interface\FrameXML\UnitFrame.lua:360: attempt to index global 'statusbar' (a nil value)

In that file, in the UnitFrameManaBar_OnUpdate() function, this is line 360:
if ( not self.disconnected or statusbar.lockValues ) then

I believe it should be using self instead of statusbar on that line.

Thanks for the report, we'll get this fixed for a future patch :)