Not sure how to describe this. I played a bit of a long game, 1 on 1 vs Petra medium. At the end of the game there were two enemy women hiding in the trees that I had to hunt down (which took WAY longer than it should have, but that's another matter). While hunting them, two bugs appeared:
All tooltips dissappeared. I tried turning off and back on detailed tooltips in the options panel, but it made no difference. When I hovered the cursor over the tech or building icons, I got nothing.
The music quit. Other sounds continued.
I don't know if these will be reflected in the crash logs, since the game didn't actually crash.