Nah. Couldn't have been the Rollback; she joined quite a while after that happened. I don't even see how it could cause negative tu at all, actually. o: Perhaps it's just.. some sort of v2 glitchiness. I recall a lot of people saying they had negative tu when it was first launched. Maybe there's still some occasional problem with it.
The best way to figure it out would probably be to send in a support ticket, Borris.
And the Rollback, Knux, was a pretty big event in August 2008 that reverted the entire site back to the state in which it had been three months before, in June. It was pretty much a last resort solution to a hack that had left Res down for three weeks and whiped part of the database. Lots of people lost lots of stuff they'd gotten between June and August.
... Lard, I wrote a lot there, for something like this. xD