Did something break compatibility on the QFG 5 gog pack in windows 7?

I remember installing and playing it just fine, but now I get different errors with the version in the current installer.

With a straight installation I get memory exception error.

I tried changing the compatibility to windows 95, but that just caused the game to "stop working".

If trying to change some of the other settings such as run in 640x480, disabling visual themes, or desktop composition, it just causes the game to sometimes complain about not having directx 5.0.

Trying windows 98/ME compatibility just causes it to stop working.

I'm noticing additional problems with other games, probably not related, and may be affecting dosbox in general.

When I try to load the older games, dosbox appears to try to load. A box appears with the text "SDL_app" in the heading, and then dosbox crashes and quits.

Ok the weird SDL_app error only seems to happen when I try to load games in dosbox to 'full screen' mode.