Look at screenshot and see where cursor is and what is highlighted. It is impossible to select “File Media Source”. Basically the problem happens if a sub-menu does not fit on the screen. That black bar at the bottom is my task bar.
My set up: Windows, 4K monitor, 3840x2160
I run editor as: “C:\Program Files (x86)\Epic Games\4.15\Engine\Binaries\Win64\UE4Editor.exe” -enablehighdpi
I ran a couple of tests on my end that included a 4k monitor. However, I was not able to reproduce this issue with -enablehighdpi only. Could you provide your dxdiag so that I could ensure that there are no other dpi settings that have been altered on our machine?
Actually, I do have DPI set in Windows to 150%, otherwise, all text and icons in Windows are a way too small. At any case, -enablehighdpi works only if Windows DPI set above 100 (just for experiment, I tried at 100, but then editor does not scale fonts).
I tried to reproduce the issue on an empty project (4.15), but it all seems to work. The project I’m working is an upgrade from 4.12 → 4.13 → 4.14 → 4.15
As this issue seems closely related to another issue that you’ve reported, I’ll be closing this one as a duplicate to avoid splitting information any further. Please refer to the other post for continued support: