i converted some a pdf to a series of images (png) and tried to add them to kdenlive but they show distorted and sometimes crash kdenlive.
I converted them to jpegs but they do the same thing.
I then tried other pngs and jpegs and they work perfectly.
I'm using kdenlive svn and know it is development , but since it only happens with certain images it might be in 7.8 too.
My system is archlinux and I uploaded one of the pngs so that anyone who wants test it can try http://www.mediafire.com/?dwt8ia5jkpthfh9