Hrm...I may have been having this as well. Could you still click the lower left button to "automate battle" by chance? I've had tactical combat lock up quite often on me, so it'd be nice to know what is causing it, such as a unit getting locked between turns randomly or from a bug.
Here y'go, kryo. http://pastebin.ca/1923885
Let's see... Debug Message: ------------------------- Debug Message: - Ending Turn 416 - Debug Message: Current Memory Usage: 1587072 KB Debug Message: Cities in World: 9 Debug Message: Units in World: 70 DebugMessage: Updating ZOC. Debug Message: WARNING: Flavor Text Manager cannot find any text for the topic Janusk_Campaign_Book1_Turn416. Debug Message: ------------------------- Debug Message:
I'm on windows 7 x64 ultimate with an ATI 4890 video card, 4 gigs system memory, 2 gigs vidcard memory, and got an out of memory error on turn...oh...300 or so. Pretty far up, but the game had ~1.6 gigs of RAM reserved when the error came about. Not quite as drastic as turn 40 or turn 3, the game was still functional for a pretty long while, but the error did happen. Haven't tried to play since, though, so can't offer if it is reproducible or not...
I managed to get by so far in the campaign, but that just comes from prior TBS knowledge and trial and erroring the crap out of the game. I still don't know how to accomplish some basic features though, like learning new spells by a process other than random campaign contributions. Then there's marriage. A concept I know exists, but no clue how it works or how to set it up. The lack of documentation is staggering...but then I have another problem. Within the 3 or so hours I played, the ga