Turns out that #OBS blocking new windows from opening might be not an issue of OBS but my system having too many open files.
I'm having the same issue now without OBS, too.
There is likely some process not closing files properly.
lsof | awk '{print($1)}' | uniq -c | sort -n
Reveals that it is DesktopVideoUpdater by #Blackmagic.
Again, #DavinciResolve (Blackmagic), #Lightworks, the entire video gang drives me mad today.






