Thumbnails & Quicklook preview has incorrectly positioned pictures.
29.8.1 thumbnails und Apple Quicklook show previews with incorrectly positioned pictures. This was a bug present in earlier versions, but in the actual documents.
After fixing it inside of Ai, the bug is now in thumbnails & Quicklook.
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iconwerk commented
When you open an .ai file with Quicklook the positions of the pictures are completely messed up. When you open the .ai in Illustrator the positions are correct.
So the .ai file seems to clash with Quicklook and the Thumbnail view in Mac OS. -
Can be related to this bug:
Artboards & Content are displaced after saving and opening a file
http://illustrator.uservoice.com/forums/601447/suggestions/50515743