Oops. That's because it's on TWC.
http://www.twcenter.net/forums/showthread.php?t=40497
Read the parts about changing your faction in the middle of the campaign, how to do it etc.
Basically, the crash should consistently be during a specific faction's turn. What you have to do is add a line to the scripts to give yourself over that faction, move the armies manually (you can do whatever you want, be it just move them where ever or actually play a turn as the faction. I usually delete units that are too depleted or send them to retrain, fight battles that need to be fought; basically pretend the faction was mine. The most important thing is to move the field armies around, merging them if needed), and when you're done save your game. Then exit RTW, change the line in the script to switch to your original faction, and it should be fixed.
Just to note, some people can get lucky and never get this crash again. Others get it fairly ofter (every 20-40 turns or whatnot). If that happens, just repeat the process. It can be a pain, but you at least are able to continue your campaign.
EDIT: Also, remember to delete the lines added to the script when you're done.
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