Version: UE4.9.1
Description: I recently plugged in the HTC HMD into my dev box and then restarted UE4 and ran a couple tests in VR with it. I then shut down UE4 and switched to Oculus Rift DK2 and resumed normal development. Somehow, a few things got really messed up and the editor behavior got a bit wonky.
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When I tried to open a behavior tree, it would show up in a new window but nothing would be visible. I shut down the editor and restarted it. Same issue. I could see the window appearing in the task bar, but wasn’t seeing anything. It turned out that the window was being created, but the window size was so small that it wasn’t visible (something like 1 pixel by 1 pixel). The only way to fix this was to right click on the window in the task bar, select “move”, which then lets me translate the window on the screen and also resizes it to a minimum size to include the close, maximize and minimize buttons. Somehow I was able to click the maximize button and things resumed as normal.
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Another possibly unrelated event was that somehow none of my print methods were outputting to the screen. Somehow, the console command “DISABLEALLSCREENMESSAGES” was run without my knowledge.
Repro steps: I have no idea what happened, the editor just started behaving funky after switching between the HTC and Oculus VR devices.