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.
2
votes

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Can be related to this bug:
Artboards & Content are displaced after saving and opening a file
http://illustrator.uservoice.com/forums/601447/suggestions/50515743