The problem occurs with FrameSlide file effect.
if you put a large number of photos (49) to display freezes and shows an exclamation point, reducing the number of photos such as 28 works, the strange thing is that your example on your site works with a large number ... also if I switch the screen view full stops equally well with 28 photos.
It 's a problem with memory usage? I also tried to update the reader to the latest version of Flash but the problem remains.
I decreased the size of every photos to show (they were all 2100x2800px) and I tried to upload up to 58 photos, at this point it works but not full screen when it crashes again.