I've had some success with Captain Sim products in Windows 8, but not with all of them. Like you, some seem to cause fatal errors. The thing to be aware of is that none of the Captain Sim products a certified for Windows 8 (yet). :-/

I'm not sure if I have even tested the 767 in Windows 8 yet. Seeing as I did not start a topic on it, makes me think that I haven't. Sadly, FSX in my Windows 8 keeps Crashing To Desktop, so I have given up on it for now. :(