Your problems have nothing to do with the upgrade as such. Rather, they're caused by your document having the 'automatically update document Styles' option checked and the use of a new 'Normal.dotm' template for the documents instead of your old one. You really shouldn't have the 'automatically update document Styles' option checked for a document using the Normal.dotm' template; either don't use that option or use a different template.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]