Rats. I don't have many suggestions for ya. But...now that it's been over a week, did the Full System Check fix it for you?
Are you running Vista?
Are you temporarily turning off Antivirus, Firewall, etc. to see if that helps?
Have you looked here:
http://forums.station.sony.com/mxo/..._id=12400011736
and most importantly, here:
http://forums.station.sony.com/mxo/..._id=12400011161
Let us know if your problem is/isn't solved. And good luck to you!