As some people reported, in this moment QuadCamera doesnt run with iPhone OS3.0 beta.
I will fix this problem as soon as possible, definitly before iPhone OS3.0 product release.
Finally, I could run QuadCamera and ToyCamera both on OS2.2 and OS3.0. I wil send fixed version to apple. I hope you can get it soon.
QuadCamera 1.95 is sent to apple. Problem is that they keep rejecting my recent update for more than three weeks. I hope it can be out, but not sure.