Problems still persist. So this morning I decided to reboot all affected components: first turned power off to computer, RT31P2 and UVerse box. Let all sit for at least 2 minutes. Then powered up the UVerse box - it takes a long time to be ready. When it was, I powered up the RT31P2 and finally the attached computer, from which I'm typing this. If this doesn't get things working normally, I guess, it's ticket time. And, UDP 5004-65000 forwarded to the RT31P2 from the UVerse box.