Just confirming that I experienced the same crash a couple of times. It definitely occurred on a couple of occasions of pressing F3 during playback of a fairly complex mix. It did not happen when playback was stopped. Exactly like in your video, Denicio. One crash was a big one that required a hard restart of Windows.
(Incidentally, note that with the new C8 windows handling, as a workaround it seems you can just leave the mixer window “open” or minimized/hidden by the project window or an editor window, and use Alt+Tab to toggle through the various open windows, Windows-style. This works well but doesn’t make the crashes OK, of course.)
Before posting this I went back to that mix to see if I could reproduce the crash - this time it didn’t happen although I only tried once. I’ve had the “serious problem” crash a few times at various times and did not keep track of each thing that triggered it.
That’s all I have for now, hope it helps.
[Edit: I added this same post to the “Issues” post on the same topic. Sorry about double posting.]