[Mobhack]

I have just tried that and have no problems with loading any custom map.

Is your crash coming when you press the load custom map button, or after you have selected a map?.

If it is after you have selected a map - perhaps the map is corrupt. So try loading another map than the one you tried before, and if that loads then the original map is possibly suspect. If not then please let us know which map number, if it is one of the supplied stock maps, or if it is one you made yourself or loaded from elsewhere then please zip it up and attach it to a post.

NB - if the map was for another SP game then naturally it wont load (e.g. WaW, original SP etc).

cheers
Andy