I've re downloaded the last expansion and the problem persists. Same settings with only Drath and Korath as opponents this time and CTD. Any suggestions on what to try?
I dont show any crash submissions (a popup when the game crashes) from your ******[email protected] address. Are you submitting them under a different email address?
Also, are you running the Opt-in or general release:

Does it happen under both?
At the very least, please upload your:
\Documents\My Games\GC3Crusade\debug.err
To a cloud service (GoogleDrive, OneDrive, DropBox, PasteBin) and post a shared link here.
Sean Drohan
Stardock Support Manager