Around turn 48 I started a tactical battle, which resulted in the white blank tactical screen.  I pressed the auto-battle button, won, and was returned to the strategic map.  I believe both before and after the tactical battle I was NOT zoomed out to the cloth map.

Once back on the strategic map the program slowed down to a few frames a second, from at least 30+ frames a second before the tactical battle.  I saved and exited the game at that time, and the debug.err file below is the result.

If you need the saved game as well just let me know.  The game continues fine after restarting it and loading from the saved file.

Attached is the pastebin link for the debug.err file:

http://pastebin.ca/1925253