Maybe it's of some help in the debugging process. Yesterday I have installed iPhone's 3.0.1 version of its OS. Now sometimes I can enter the 'number of frames'-screen, and sometimes I can. I have tried to find a pattern, but it seems completely random. That is, I open the app, instantly click the screen, it opens. I go to homescreen of the iPhone, open app again, click it again, and it crashes me back to the homescreen of the iPhone. It happens somewhat in an order I as a developer (but non-iPhone dev) cannot seem to understand. It seems amazingly random. However, updating to 3.0.1 helped a lot. Seeing this is a parameter I won't change too much, and others probably with me, I think the bug is a tad less critical.
If you however would find the bug, I would be interested what caused the randomness :)