Vista - Media Center Extender and RadioTime

I recently purchased a Linksys Media Center Extender for use with my Vista
Home Premium desktop PC and found a problem with one of the Windows Media
Center features when accessed from the extender. When using WMC on my PC, I
am able to fully utilize the RadioTime feature in order to listen to internet
radio streams. But when I attempt to select the same feature through my
extender, I am told "NOT DESIGNED FOR WINDOWS MEDIA CENTER - This Web site
may not be designed for viewing from a distance or for remote control
interaction..." After speaking with Linksys support and troubleshooting for
quite a while, they were convinced that it was a problem with WMC and not the
hardware since the unit (DMA2200) was designed to allow use of that feature.
Anyone have any ideas on how to get this working? Thanks.