The latest (10.0.1) - I was rather hoping it would've correct itself with that update, but it didn't. Happened with 10.0 as well (when it was released shortly after the presentation).
Of course - all the usual troubleshooting that I'd carry out (I'm a Service Desk Analyst). But thus far, I've not been able locate anything that may be causing this. I initially thought it may be DNS related - as I was using OpenDNS - but that wasn't the cause. I then thought it may be an issue with the iTunes 10 installation - but that was recently updated to 10.0.1 and the issue still persists. Hence why I've turned to MR to see if anyone else is experiencing the same issue.