For some reason, starting today (Apr 15) all of my program information is coming up as "Unknown." I checked my zap2it account and it doesn't expire again for another month, I rebooted my knoppmyth box, but the problem persists. Has anyone seen this?

Take a look through /var/log/mythtv/mythbackend.log for mythfilldatabase errors. Something in there should give a hint as to the problem. Alternatively you could run mythfilldatabase --refresh-all from an xterm and see what errors pop up.

Make sure you do this as the mythtv user. Running mythfilldatabase as root can cause problems.

That fixed it, thank you. (My DNS changed and I forgot to update resolv.conf, so it couldn't resolve zap2it)

No kidding? I didn't know that, thanks for the tip tjc.