You can open up your files in AI and it's all good, right? This might be a total shot in the dark, but worth trying at this point. Go back and open up the file, then do a Save As (or Save a copy) and select .eps, and in Version, select something really low - like Illustrator; or as an .svg of VW can import .svg files.
There are bits of information and embedding that might be happening in the newer versions of AI that VW just doesn't like. I run into it all the time. Give it a go, it couldn't hurt to try at this point.