First campaign in RTW.
Playing as the Julii, RTW installed from the Anthology DVD.
Things were fine until about Year 203BC.
I keep getting CTD during the endturn phase, during what seems to be the movement phase for the Britons.

The Error message has this in the details box:
Problem signature:
Problem Event Name: APPCRASH
Application Name: RomeTW.exe
Application Version: 1.0.0.0
Application Timestamp: 438afb5a
Fault Module Name: RomeTW.exe
Fault Module Version: 1.0.0.0
Fault Module Timestamp: 438afb5a
Exception Code: c0000005
Exception Offset: 005ec267
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 05df
Additional Information 2: 05df6ed422dc4e1fb77fc8b8da810699
Additional Information 3: d44c
Additional Information 4: d44c06c10c403a49161509e9e9947c3e

I am able to complete the end turn by opening the console and entering 'disable_ai'. I did that a couple tmes and now it crashes during my turn, with the same error details.
Any help would be appreciated.