I keep getting this breakpoint hit when working in the editor in the 4.8 promoted build:
http://puu.sh/g4aG9/55f18423e5.png
The issue occurs when you hover over any of the component tooltips:
http://puu.sh/g4aMv/44c1f25cf7.png
You can however step through the breakpoint and safely return to working through the edit, you just have to nimbly dodge hovering over anything with a tooltip it seems.
To replicate just create a brand new blank C++ code project open the editor get into play mode and then eject and click something, I clicked DefaultPawn, then go to the component section and hover over one of the components, if the first component doesn’t kick the error try the rest of them.