CHANGELIST: 
4.5.0-2316912
  
CRASHREPORT: 
Did not produce an error report
  
CALLSTACK: 
Did not produce an error report 
  
DESCRIPTION: 
  Editor Crashes when placing a widget blueprint from one widget blueprint into another via the  user created  section
  
IMPACT: 
  Editor Crashing
  
  
FREQUENCY: 
3/3 
  
  
REPRO STEPS: [reproduced internally]
1.    Download attached Zip file
2.    Unzip and Run Unreal Engine project file
3.    Navigate: Content Broswer > Game > Blueprints> WidgetA
4.    Navigate: Content Broswer > Game > Blueprints> WidgetB
5.    In WidgetA Designer tab go to Palette (on the left)
6.    Scroll to the bottom untill you see  User Created 
7.     Expand User Created
8.    Drag WidgetB into WidgetA Designer graph
9.    Repeat Steps 5-8 for WidgetB
  
RESULTS: 
  Editor with freeze and then after a few seconds it will crash
  
EXPECTED: 
  WidgetA to be placed into the WidgetB Designer graph
   
  
ENVIRONMENT: 
OS: Windows 7 Professional 64-bit 
PROCESSOR:  Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz, ~2.1GHz 
RAM: 32GB RAM 
SOUND SETUP: Headphones 
DIRECTX: DirectX 11 
VIDEO CARD: NVIDIA GeForce GTX 770