No, still hasn't been resolved. Contacted ST twice now, just got off the phone with them today, they think it might be my SIM card, so they're sending me a new one. I'll update when I get it, whether or not it works.
Weird thing I've noticed is, when I click the "sign into network" notification, and the webpage starts to load, if I quickly go back to the home screen, and try something that requires data, it usually works, in the time that it takes the site to load. After that, nothing. I don't believe it's my SIM, honestly, I think something is up on Tmo's end, but I keep getting these lackeys at ST, and after the usual run around of restarting my phone and trying new APN settings, they do this.