Pagination/Building Blocks problem

[ijblack]

After countless successfully formatted documents, suddenly Word 2007 won't paginate. I get the error message "Word cannot open this document template C:\users\...\1033\Building Blocks.dotx." When I opened that file in Word, the Insert Page Number ribbon was grayed out.


I have followed instructions regarding removing the original BB.dotx files and letting Word rebuild them. It didn't. I even did a full Repair reinstall of Office 2007 Enterprise. Both copies of the file are back in place.
Still, I can't get Word to paginate. Any help, please?