This is a weird one I discovered recently; if you have your game folder in the root of a volume (say, you run C:/Jazz 2 TSF/Jazz2.exe), then it will play, but fullscreen resolutions will be unavailable, and trying to go fullscreen with ALT+ENTER will make the game window momentarily go dark, but have no other discernible effect.


It's easily fixable by just putting the game folder somewhere else (for instance, C:/Games/Jazz 2).
I don't know if it's worth investigating why this happens, but I figured I should report the bug anyway.

I'm afraid I can't reproduce this. A C:\Jazz 2 TSF\Jazz2.exe can enter full screen for me without any problem, no matter whether it's vanilla or JJ2+.

Checking it again now, I can't seem to recreate it either.

Not entirely sure what fixed it, but there was a Plus update between my post there and now.