Methods don't like function pointers?

Please see this thread. I thought it was an OpenGL problem, but it looks like it goes deeper than that:
http://blitzbasic.com/Community/posts.php?topic=59652

When I declare a global win32 function, then fill it with a function pointer, I get a crash when calling it from a method. It works fine when called from a function.

it works fine now.

That's one piece of code I am going to leave alone.