It may be relevant that window manager is kwin. The windows seem to be fnctional and reciving clicks - so if I can guess where the button may be I can actually click it. It happened with lighting window when I first got it from windows dialog for exampe. Only way I could make it show is by grabbibg the tab blindly and dragging it into the layout and then restarting unity. Once in main window it rendered properly. Same thing happened with the asset package import ecept that isnt draggable and all I could do with it is find the Open button blindly.
This seems to happen to most windows eventually, including the build settings one and I have to restart unity to get them back for a bit.
For In/Exclusion purposes: I have not experienced this on xfce4 so far.
outofbounds, thanks. I will try switching DE for now, to see if it helps. It definitely feels like a bug that a funny behaving window manager can cause.
xfce seems to be no cure unfortunately. Still windows stop rendering after a while.
The command line parameter in release notes does not help BTW. I’m stuck with reopen if I discover something missing content display. 5.5 had content offsets, this seems like 100% offset, progression of th partial offset bug.
This bug is a real pain. I either restart in every 10 minutes or so or run half blind but that only helps me until it gets to main window. The main window also stops updating after random fg-bg operation…