Civ 4 BTS (Orbis) - Random crashes in Win 7 64-bit

[qev]

I've been trying to get back into playing Orbis, but it gets difficult when the application crashes at random intervals.

Basically removed Civ4/Warlords/BTS, defragged, updated graphics drivers, then followed the helpful "How to install in Win 7" thread here. Everything was working fine for a few days, now it's back to APPCRASH and useless Event Viewer logs. The consistent thing about the crashes seems to be that they occur when nothing is going on; the game is always idle when it occurs (ie. not occurring during turn processing, or any in-game event).

The Event Viewer logs are odd too - One says Civ4Beyondsword.exe crashed itself (event id 1000), one says it was crashed by an unknown module (also 1000), and one says that it was unable to access a file named... well I guess the name was redacted to protect the guilty, 'cause it was blank (id 1005).

I'm a bit bewildered, so any assistance would be happily accepted.

 

[qev]

Oh, after poking through older Event logs, it looks like D3D9.dll and one of my (ATi) graphics driver DLLs were involved. No idea if that'll help anyone looking at this or not.

 

[qev]

Wow, here I am talking to myself.

Anyway I seem to have fixed it somewhere in between nuking the BTS game cache folder and the Windows page file. Mischief managed!