[Foodstamp]

It sounds like something to do with your banner when the mod is enabled. Don't panic, make sure the banner file you are using is a .tga file of 32 x 128 or 64 x 256 uncompressed, 24 bit.

I would try deleting the files in the mod directory to see if a mod is causing the issue. Be sure to just paste these files somewhere else so you still have them.

As a last resort I would reinstall the game, but mods should not corrupt your game in a manner that this is needed.