Scale bug during export in CS3!!!

I have a slideshow which all of the pics are scaled with the option "scale
and crop edges". When I preview it in encore it looks perfect. The problem
occurs when I export/builds the dvd, flash or whatever. When I playback the
slideshow it looks like some of the pictures jumps between the two scaling
options "scale and crop edges" and "scale and apply matte".
In one frame the picture fills the entire screen and in the next frame it has
1/4 of black matte on each side. The jumps in scaling happens totally random, or
at least I can`t find a pattern.

I appreciate all feedback!

Thanx for the answer but, No, I don`t think so! If it is what`s the symptoms and
how can I fix it...

Any other ideas??? I have very little time to fix this problem and I don`t have
time to create the slideshow manually in premiere...

      If it is what`s the symptoms and how can I fix it...

Yes, I did look at it. I don`t think this is the problem, but if it is, how can
I fix it??

I think there is a bug in CS3... I can upload a sample from the slideshow and
you or anybody can look if you want!!!