I tried changing that setting in jamp.exe from the thread you linked, however it did not seem to solve the issue of crashing when using the video settings I used to use.
I joined a server after setting back to default settings and changed each one of the settings one by one to see which one...
I just tried running the game through the MBII client, unfortunately I wasn't able to complete loading a map after joining a server even without touching my settings.
So I recently upgraded to Windows 10, and now I'm having issues running MB2. I tried playing shortly after the upgrade, and while joining a server at some point when the bar on the loading screen reached 2/3 full, my game crashed and I encountered this error:
139292 files in pk3 files...