What type of image, vector or bitmap? What are your rendering intents? Is there an imbedded profile anywhere in the process?
The wrong combination of things such as these, and perhaps others, can result in funky whites.
It is a vector image, small round decal, text and solid colours.
It looks like I tried to use the Max Impact setting, and it was doing it...
In VW the only thing I could find was colorimetric.
How can I find if there is an imbedded profile in the file?
I'm having a problem like yours, except it's with photoshop files. I'll build an image or part of an image and put it into illustrator to complete the file & it makes no difference if it's flattened / rasterized etc, I get the pinkish grey box where it should be white. It is the exact size of the PS art board. (yes it reads 255 with the eyedropper) Pure vector files do not give me this problem.
Is it a possible mismatch in settings with Illustrator / Photoshop and the rendering intents in VW???
My VW rip computer is not online and we run the VW without updating it. The only variable that has changed is my design mac needed replaced and Adobe reloaded.
I know it's no help to your question, but maybe my situation gives you another angle?
http://www.signs101.com/forums/showthread.php?121651-Photoshop-Help-Please
I had something like this happen to me a few times with a blank background still printed a light pink. Went back into signlab and put a white box in the back reprinted and printed fine. Not sure what is the deal with it. Since there is no clipping mask or nothing there, but it still prints pink. Unless I add that white box in the back.