I just logged in recently and found an "upgrade" for my M&M i-VI 6-pack. I downloaded the new file listed as "setup_MM16_limited_edition_126.96.36.199.exe" When I installed the file, I had new round game icons. I started a new game of M&M VI. After playing several hours, I discovered the Shadow Guild Hideout in Castle Ironfist has been rendered unfinishable. The switch that should open the way out no longer works. I've been playing this game for years. I know how that quest works. It did before the "upgrade" . It doesn't now. Help?
Do you have the old version installed so you can test the save file on that? You could upload a save file here if you rename the extension to .jpg instead of .mm6 and I'll see if I get the same bug. Other than that I'd suggest sending a support ticket with a save file attached.