PDF thumbnails/previews incorrect

Since updating to Snow Leopard the thumbnails of my PDF and Illustrator files do not display correctly. It seems to be ignoring any layers that are set to be invisible and makes them visible regardless (please see example screen shots):
http://dl.dropbox.com/u/3454522/boxes1.png
http://dl.dropbox.com/u/3454522/boxes2.png
Any ideas?

I admit to not being an expert on PDF/AI, and similar. Both of these files are actually PDF documents. There are very few lines of data that are different between the two. A few of those "lines" aren't lines at all - they are large chunks of binary data.
It appears that Adobe is just using the PDF format as a wrapper for their own proprietary data formats here. Since Adobe makes both Illustrator and Acrobat, they include parts of Illustrator in Acrobat so that it can properly render the "PDF" that is actually Illustrator inside.
So when you save as PDF with that option off, you get a true PDF. When you just save as AI, you get a PDF (which Preview thinks it can display) but really has more data than Preview understands.
Nothing has changed between 10.5 and 10.6. Neither version of Preview can correctly view this file. Since Preview is based on the OS PDF display capabilities, there will be very few tools that can view this data. I could import it with Inkscape, which displays the preview correctly, but seems to lose the layers upon import.

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