Update: USB Sync is not working since the update. I contacted Vizio Support, but they were not on top of the issue. They kept wanting me to install USB drivers on my computer. I'm pretty sure that isn't the issue.
I will try and sync my tablet up with my home computer when I get home tonight.
It's possible I can find an app to kick the tablet into USB Sync mode manually.
To be clear: the tablet detects the USB connection and flashes the charging symbol, but does not display the "Do you want to go into USB Sync Mode?" screen.