Has it happened to me, yep, today even, do I have a definite solution, nope.
Today it happened with a psd file, saved in Photoshop 7, and it had layers. I resaved the image in Photoshop, after flattening it, and it ripped fine. I don't think that layers is the problem because I have done numerous files alright with layers, but that is the only thing that I changed today.
Also, sometimes I would open the Production Manager and tell it to rip the file again and it would work. It would be nice to know whats up, but this is Scanvec we are talking about.