Close button after combat causes buffer error/kills game

I was putting off reporting this bug since I wanted to keep playing the game, but now I put a ship somewhere that another empire attacks when I hit the Next Turn button...

So combat goes fine, but when I click the Close Button at the end of it, whether I win or lose, the game crashes showing a Windows dialog titled "Exception" and text "buffer error", after clicking that away I get the ubiquitous error dialog about an address.

Where can I dump my save file(s) so someone over there can fix it?

It may have started back when an empire I had a treaty with attacked me, but I did not destroy the ships - I left them with some life support and an engine or two. I know in my current game at least one of their ships seems disabled in my space. I've been avoiding battles for a year or two so I could keep playing...

What else do you need to know? What can I do to help?

Thanks!

-Chris