Charlie Owen:I'm fairly certain AOL Radio has chosen to no longer be featured in Online Media -- that's why you no longer see in the Explore feature.
AOL Radio had "returned" previously after disappearing for a month or so. It has left again.
Strangely, I have an old Gateway XP with Media Center (unused, most of the time, and languishing in a child's old bedroom) which still has AOL Radio functioning (as of 8/1) in Online Media, so the content continues to be available and streaming from AOL, but my Vista Media Center does not have AOL Radio listed.
Each Vista Media Center update breaks something, it seems, and repairs something else. Sigh. For consistency in my living room, I've had to switch to an NAS running Twonkyvision, sadly. I lose lots of functionality, but I gain consistency. This is truly sad because the Vista Media Center machine is a dedicated machine bought specifically to fit into my Home Theater set-up.
I'm going to try the trick of moving the Spotlight folder and letting VMC reinstall the Online Media applications. Thanks for that tip, Jeff.