I'm probably the wrong person to answer most of your questions, but
Any ideas on where I might go next? I'd like to get to the bottom of this crashing problem.
How can I narrow down where the problem lies? How can I determine why an equivalent C program works, but the Haskell program crashes? Is there a way to trace just exactly what the Haskell program is doing?
there are some opengl debuggers and tracers around - I'm googling for a free windows one, mac users seem to have such support provided by apple, other platforms have their own. I don't have any experience with these, but if they only show the opengl calls, it may be possible to compare the c and haskell runs, especially where the hopengl version tries to mimick the opengl version closely instead of introducing higher-level abstractions. I'd be interested in recommendations, if anyone has experience with such tools. cheers, claus