Hello. I have the same problem. I have reported the following to NCH in a 'bug report':
1) Create a slideshow with over 900 photos and compile to an ISO or DVD.
2)'Make DVD Movie' -
Burner: Image File (or my DVD drive)
Video Format: PAL
Video Aspect Ration: Normal
'Save Slideshow'
3) The process seems to work perfectly, but when played back, the ISO (or DVD) 'sticks' on a seemingly random image, skips a few, then resumes.
The image that 'sticks' changes arbitrarily every time the slideshow is built. I have tried this around 10 times so far and wasted many hours.
I am not using any fancy effects, just a common transition and an added music soundtrack.
This problem is mentioned by another user in your Forum:
http://nch.invisionzone.com/index.php?showtopic=15617
I am very disappointed and am very close to asking for a refund.
Thank-you.