Linux - cannot click top left in full screen

Distro: Ubuntu 16.04 LTS

With my UE4 application running in fullscreen mode, I have found that I cannot interact with UMG widgets in the top-left corner of the screen.

I’ve managed to recreate this in a blank project with a check-box widget in the top left of the viewport:

As suspected, once packaged for Linux and ran on my Linux testing machine, I am unable to click this widget, and no tooltip even displays on hover.

Interestingly, if I force the application into Windowed mode, it works fine.

Hey -

I tried creating a widget with a button, and when I entered fullscreen I was able to click the button as expected. Could you provide the setup/repro steps that led to the behavior you’re seeing?

I had a bit of time to look at this today. In a nutshell, it’s the Ubuntu launcher interfering somehow with the UMG widget click. Funny thing is, I seem able to interact with the world fine along that edge, but the UMG widgets are not receiving any events.

I got my colleague to test it on his Ubuntu machine, sure enough, he experienced the same problem. I wonder if, in your test, the launcher was set to another monitor or it was perhaps set to auto-hide when the user isn’t interacting with it?