This morning I installed a number of updates, mostly to Windows 7 and Office 2010. Perhaps it's just coincidence, but when I click on any of the documents (either Pinned or Recent) on the Taskbar jump list for Word 2003, a new instance of Word opens without any document, much less the one I clicked on. Luckily my Work menu is still working, but the two lists don't entirely overlap. When I click the X to close the empty Word window, I get the "Changes have been made to the Normal template..." prompt (entirely without cause). I decline to save it, and the Word window closes, leaving the original instance of Word still open. I've come to depend on the jump list, so this is very distressing.
The problem seems to be confined to Word: jump lists for Excel 2003, Publisher 2003, Word 2007, Word 2010, and IE 9 still work as expected.