Of course, I rebooted and when I try to start Van Civ it gives me a 1/2 second hour glass, I hear the computer hum a little extra for a few seconds and then nothing. To resolve the issue, I must uninstall all and start from scratch. I've done this 2, 3, 4 times now when there have been Vanilla Civ difficulties in a couple of games. I am done with un-upgraded vanilla games. Sorry guys, its too much of a hassle.