Pure virtual function being called while application was running (GIsRunning == 1).
Happens even when I start a new project. This wasn’t happening for me before and it’s basically preventing me from using UE4.
This happened after upgraded to 4.11.2
After uninstalling fixit plugin as suggested here it worked. Pure virtual function being called while application was running (GIsRunning == 1) - Programming & Scripting - Unreal Engine Forums
If you don’t have Fixit installed, then it might be something else.