I'm having an issue that I can't seem to resolve. The game is running full-screen, but it's cutting off the edges, such that it's fairly unplayable. The buttons on the edge are hard to get to, etc. The edges are still there, my mouse can run off the side of the visible area and such... it's as if it's zoomed in or something.

I've tried messing with just about every compatibility setting I can think of. Any suggestions?

Install GrayFace patch: https://sites.google.com/site/sergroj/mm
Believe me it's a must for MM6-8 games ;)

Yup, I installed that as well, still didn't fix my display issue :(

Apparently someone else had the same problem. Check out his solution:
http://www.gog.com/forum/might_and_magic_series/full_screen_cropped_might_and_magic_vi/post2

Haha, amazing, this fixed it. Thanks so much!!