Another annoying bug that I keep running into but am not sure how to trigger and reproduce.
Sometimes I'll be editing and then suddenly I lose the ability to navigate. The mouse cursor becomes a dot and it's like I'm stuck in some weird alternate mouse mode and utterly unable to do basic things like rotate the view cube. Occassionally I'm able to break out of that through a long / random sequence of clicks, random keypresses, and language inappropriate for the delicate ears of adults, but most often I have to quit, restart, re-open my design, sacrifice a goat, and pray that it won't happen again before the inevitable next crash (in ~10-20 minutes).