I'm getting something similar. When I play tracks, I get Invalid Track Format quite a lot.
When I run emplode, it tells me it's going to fix things. It does this for a little while, but I get a lot of warnings, like " was missing metadata", then "Extracting frame info for failed - defaulting, Unsupported/Invalid MP3 format. (error 0xc0040012).
If I try to sync, I get Sync failed... Wrong session cookie (error 0x80040059). All I can do is quit :-(

Apart from that everythings great! Love the new visuals! :-)

A lot of my MP3s are VBR encoded with Xing Audio Catalyst, is this a problem?

Phil.