Hi ,
Could you please provide some additional information to help me reproduce this issue?
- Are you using the Binary version of the Engine, or did you build the Engine from source code?
- Would it be possible to see the code for your GameMode class?
- What specific changes, if any, did you make to your class when upgrading to 4.8?
- Does this crash occur while you are editing the GameMode Blueprint, or when actually launching the game? Do you also see the crash in a packaged version of the game?