I've trained myself pretty well to not undo a move to the standard lights...but it still catches me from time to time. Like just now. So, while 3ds Max reboots, I figured I'd come here and check in on this bug.
FWIW, if you're wondering why I'd use the standard lights to begin with. It's to give me control of the visibility of the light source while still giving a 'specular' contribution. The standard lights with Corona shadows also give me control of the softness of the area shadow independently from the size of the light source.