+1 To the list of users afflicted by this bug (Windows 7 Enterprise, Intel GPU).
I wasn't able to realize the sequence of steps before but getting these has been consistently destroying hours of my work (as I explained in this thread asking for auto-saving)
Keep your work safe with C2's backup options ?
@Kyatric , I use this to its fullest most paranoid settings and it will still not protect your work from this bug unless you break your concentration to manually save.
This is why I think a timed save is necessary.