I've got a mdl with 140 frames. If I invoke c_updatehull with frame 96 or above, the engine will crash. Which is unfortunate, since I wanna ues frame 107.
If A7 crashes with your model, maybe the mdl file is damaged, in that case save it in MED again. If it still crashes you should post this as a bug report?
I had a mdl with hundreds of frames and cant remember a problem with c_updatehull, it might be something special with your model.