Thanks for the reply!

I tried your advice, going back six years. I sped up the process, but again, as soon as Capua goes Huge, the game crashes.

Here is a link to my save game file.
http://www.filefront.com/15043351/pah237.rar

If you or someone else could give it a whirl, I'd appreciate it. I have not had a problem with other factions.