Does anyone have the same problem? I can't play Online TV on my linksys DMA2100. I get the message: Some files that are necessary to play video are not installed or do not work properly. Restart Windows Media Center or restart the computer.

It depends on the format of the Online files.  Extenders can't play certain video formats.  For example, using TV Tonic, some video files are greyed out on my extender because they are not playable. 

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Asus P5E-VM HDMI (onboard audio/video), Core 2 Duo E8200, 4 GB RAM, Hauppauge HVR-1800 (x2), LG-GGC H20L, DMA-2100 (x4), Yamaha RX-N600, InFocus IN76, D-LINK DIR 655, Vista Ultimate

Also with the standard Online tv that is installed the first time you use it? It has worked, but I think after the latest firmware it doesn't anymore.

I have the same problem.  Plays recorded and live tv perfect via wireless but will not play any online content like the movie previews or the tv shows etc.  Anyone know a fix?

I'm having the same problem on both my DMA 2100 and my HP Media Smart Connect.  I get the same message.  Online TV works fine on my pc.  I'll be watching this thread to see if anyone has any helpful suggestions.

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Jeff