We're currently encoutering an issue on our production servers with Office 2007 documents. In essence, the Content Type for all docx, xslx, and pptx documents cannot be changed away from the site default on all newly created sites.
I've even done some step by step debugging on an SPItem insert and I can set the content type to a custom type, but it reverts back to the site's default Content Type on Update(). Other file types - .doc, .xls, .tif, .txt, and .jpg - have all been tested,
and all work as expected (the Content Type changes correctly).
Thanks in advance!
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