Crash / BP corrupt after changing material

  • I changed a material on a UStaticMeshComponent in blueprint.
  • Tried to save; it said: Due to reference to external HOTRELOADED something… not able to save.
  • I closed Editor.
  • Afterwards, if trying to ope BP, unreal crashes.
  • If started with VS the following assert is provided:
    Assertion failed: InSCSNode->ComponentTemplate != NULL [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Editor\Kismet\Private\SSCSEditor.cpp] [Line: 3101]

I am experiencing 5 to 10 crashes (if not more) per day with unreal editor…