One that I've hit recently is that an open colour picker window prevents quit from doing anything. It also doesn't show the colour picker window, so I don't kno

One that I've hit recently is that an open colour picker window prevents quit from doing anything. It also doesn't show the colour picker window, so I don't know why GIMP isn't quitting, just that pressing a common key combination (cmd+q) doesn't work for no good reason (colour picking is not an operation that needs to block quitting).