As your own Merle Haggard said "You're walkin' on the fightin' side of me" if you knock vegemite. (You're probably too young to know who he is!).
I couldn't relate the fix to any reboot, changing projects, etc, all of which I did. It seemed software related, rather than specific project or .story file related.
I may have been wrong about the Windows updates. Attached is the table from the Windows Updates log - looks like the last update was in Feb. And I think Java updates happen on Wednesdays.
Off to have a few Jatz and vegemite - perfect.