I think it was on-next-turn. Hadn't been playing long since last clean load -- usually I get farther before things get corrupted.
crash zip http://dl.dropbox.com/u/8928343/FallenEnchantress0_86-2012-03-02T20-23-41-781.zip
debug.err http://dl.dropbox.com/u/8928343/debug-no-reason.err