Fun times with postscript:

I have two EPS files that are generated by a program.
In there there is the postscript describing the file (~6000 lines) and then the preview image as TIFF. Each ps and TIFF image on its own renders correctly and looks good.
Now the fun part: The ps in combination with one of the images works, with the other image it doesn't. Somehow the ps-renderer tries to interpret the TIFF-data, which yields nonsense and the renderer stops altogether. But only for one file not for the other. And it's definitely not the ps, because if I switch the preview images the other file doesn't work.