Hmm. I updated the method that calculates the best defender on a tile recently, and it appears that's causing issues with Rhye's mod and probably some others. I'll take a look at it this afternoon. I might have to re-disable the 'are you sure you want to quit' message on OSX if it isn't working. I found three different ways it was supposed to work. One was rather old, and long deprecated. The one I used was deprecated as OSX 10.5.8 (IIRC). The non-deprecated one didn't work on OSX 10.4 according to the documentation. I didn't notice this when I tested it on an OSX 10.6.2 machine, but I'm not that familiar with OSX. Is it only closing the window (but not the program), or is it not even closing the window? Update: Figured out why it wouldn't load - Rhye's uses duplicate unit names. Seeing that Firaxis's editor disallows them, I had thought they weren't allowed and had disabled them. Turns out they are allowed after all. I'll add an automatic test case for Rhye's - and might throw in a few more of the BIQs I have on hand, too. Update 2: It might work if you click on the red circle in the upper-left of the window to quit on OSX instead of quitting via the menu. I always quit programs that way on OSX, and thus tested quitting that way, out of the habit of clicking red "X"'s to quit. Still not sure why it might work via red circles but not via the menu.