Title sums it up. Today I installed the Quixel Bridge plugin in Unreal 5.5 (I also tried 5.6 with similar results) on Linux (Ubuntu Studio 24.04 using KDE Plasma 5 desktop environment). When I try to open it, it acts like it opened just fine but the window never appears. I checked the logs and there is nothing notable in them (happy to paste the file, but the summary is one error related to InitializeSandbox being called with multiple threads and a number of Unknown keycode errors).
Fab has been working just fine (installed it a couple months back when I got this version of the engine and have used it without issue since), so it seems isolated to just the Quixel Bridge plugin. Without logs, I have very little to stick into Google which is why I came here. Has anyone else experienced and solved this mysterious behavior?