When Changing the between input modes with the "Set input mode UI only" node and the "Set input mode Game and UI" node the editor can become unresponsive. The user can still click on things but it will have no effect. For example. The user can not stop PIE or navigate the content browser window or pause the game.

Steps to Reproduce
  1. Open Editor
  2. Create a New Widget Blueprint
    Right Click the content browser > User Interface > Widget Blueprint
  3. Open New widget blueprint
  4. Add a button to the designer graph
  5. Add an "OnClicked" event
    Select the button > Scroll to the bottom of the details panel > add on clicked event
  6. Go to the event graph of the widget blueprint
  7. Create the blueprint in the attached image
  8. Compile and save
  9. Open level blueprint
  10. Add the widget to the viewport
    Event begin play > Create widget > select your new widget blueprint that was just made > add to viewport
  11. Compile and save
  12. Click Play in Editor
  13. Press the 'K' key
  14. Click the button on screen
  15. Press the 'K' key again
  16. Notice that the print string is now only returning "True" even thought key was released
  17. Notice that the stop PIE button in no longer responding (along almost all other Editor buttons)

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Cannot Reproduce
ComponentUE - Editor - UI Systems
Affects Versions4.7.64.8
CreatedApr 27, 2015
ResolvedMay 18, 2016
UpdatedMar 15, 2022