Buffer underflow error

I can't even pull up a bug report number, unable to get fully into the game.

Downloaded the new patch. I can log into the character menu, but no matter which character I try to log in to the game world with, I am getting this error followed by an immediate crash to desktop.

The error:

A quick update:

Nvidia had a driver update that dropped today. Updated drivers, didn't fix the problem. Full pc restart, still having issues. Reinstalled the drivers. Game let me in.

While I was doing things, found a reddit thread from just after EA released where this problem was occurring. Bunch of people mentioned that you could wait it out, seemed like it might be tied to some map instance being held open and you just had to wait for the game to time out the instance. I am guessing the patch somehow messed with whatever instances were currently open for your game.

So I am unsure if drivers + restart did it, or just the fact that 20-30m went by before I tried to log in again, but thought it was worth noting.