I don't mean to interrupt the private talk, but have you resolved the issue ?
In the quake3 engine, if you are shooting and your game crashes, it could be indeed caused by a texture, depending on various factors.
It could be caused by a configstring overflow, entity overflow, event overflow and these kind of things.
I would be interested in looking into the map (non crashing and crashing version [i would require the map files] ), as I have spend some time in my past learning about these things and optimising difficult bsp-based maps.