Not to bump this, but for anyone else who has this problem ("additional metadata...." causes a crash) check in /Library/Application Support/Adobe/XMP/Custom File Info Panels to see if you have some strays. I had four, all with "txt" suffixes. Removed them and all was well. Don't know how they got installed, but evidently they choke Acrobat (with me it was XI). There were "1.0" and "4.0" folders in there that seemed to work.
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