Yup I had a rough experience with Stubhub maybe 5 years ago with tickets to a football game (not a UT game). Bought them 2 weeks in advance but gameday arrived and the seller still hadn't transferred. I called their Customer Service about 2 hours before kickoff and was told the seller wasn't required to transfer the tickets until something like 30 minutes before the event, despite the fact that Stubhub had accepted my money 2 weeks prior. I didn't recall that policy from the purchase page but it's entirely possible that I just overlooked it. Regardless it's a terrible policy because my plan was to get there an hour early, enter the stadium, and leisurely enjoy the club-level amenities that came with the tickets I'd already paid for. Obviously it didn't quite work out as I'd hoped.
The customer service rep was trying to be as helpful as possible, had given me her direct extension so I could call if the transfer didn't occur within 30 minutes of kickoff. And, it didn't. She offered me a comp of $150 on my account for my trouble and dissatisfaction but told me there was nothing she could do to get the seller to transfer. Finally about 15 minutes before kickoff, the tickets finally transferred. We entered and got to our seats and just missed kickoff, so no great harm done but plenty of unnecessary anxiety for an experience that should have been a lot smoother.
Let the buyer beware, of course. Suffice to say I've never done business with Stubhub since.