With patch 110, I've started getting a similar problem. Skirmish battles load fine - on all maps - but RTS battles in the Campaign crash as soon as the map loads (under 101, the RTS battles merely crashed randomly). I'll see if any fixes mentioned elsewhere help.
EDIT: Turning VSync on seemed to work. I'll have to try more to be sure, the match ended abruptly because of Desynchroniztion problems.
No, it crashed again on RTS startup, even with VSync on. Looks like I'll only be auto-resolving all battles from now on.
The one match where I was able to enter RTS mode was multiplayer with a person and some AI's.
