Starting a UE4 instance force closes all other instances

When opening a project while another project is already open UE4 now force closes that other instance first without even saving! Pre 4.11 I often opened multiple projects to get content and blueprint code from one project to the other which is now hardly possible. Content would work but is annoying and copy paste blueprint from on project to the other will not because UE4 will overwrite the copy paste cache with junk in the close project and open project process. I would call it a bug because I can’t see the feature in this, maybe it even crashes the other instances? I’m using Win7 64Bit and I usually have SteamVR running if that matters.

Edit: This even happens when selecting standalone game in the play settings, so it closes the editor when playing a standalone game!


I was able to reproduce this issue on our end. I have written up a report (UE-29485) and I have submitted to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.

Additional note: This shutdown appears to happen most often if Steam VR is focused on the editor before another project is opened. I hope that this information helps.

Make it a great day