Something, but I’ll be damned if I know what it is. All I know is that on or about April 17, my D-Link router lost the ability to permit my original Xbox or 360 to log onto Xbox Live. At the same time, I lost the ability to bring up QT3 on my PC. No other website had this problem.
A bunch of calls to D-Link tech support later (worse than useless), I now have a new Netgear router, and everything’s cool. Very odd linkage, though.