Thought I should mention this. I have noticed a pattern: perhaps only because of the Freeglut/win32 problem in which it pegs the cpu at 100% forcing heroic measures to stop it, often after landing in a backtrace and fixing a bug and running again I end up with an access violation on a simple call into the FTGL. Then I have to exit Lisp and come back in. Not good, obviously, and something to be addressed before not too much longer, but for now if you suddenly see something like that you might want to try bouncing the Lisp.
kenny