I haven't used slacker radio in a while and opened it up today and it had an upgrade that I installed. I had to delete the previous version and when I did that the new slacker works fine. HOWEVER I cannot get the stations to cache. When I hook it up to the PC I get nothing. It shows up but no matter what I click on I cannot get it to work.
Try deleting the Slacker Folder and Slacker SyncLuancher program from you SD card. Then do a battery pull and run Slacker again to see if you can cache the stations.
Whenever I upgrade Slacker, I always delete the app and data from my SD card.