Apple TV doesn't recognize computer over WiFi, but does through Ethernet

Home Sharing from iTunes on my Mac Pro to an Apple TV (2nd Generation) only works if the Apple TV is connected to the router using Ethernet (i.e., hardwired). With WiFi (using the same router), the Apple TV won't detect the Mac Pro library. Everything else works fine over WiFi (e.g., Netflix and movie rentals). I can even control the Apple TV using my iPad when connected via WiFi or Ethernet. The only thing that doesn't work via WiFi is access to a network iTunes library. Any suggestions? The router is in bridge mode (i.e., it is an extension of the router that the Mac Pro is connected to). However, since the hardwire connection works, why wouldn't the WiFi connection work? And why does it work for everything but the network library.

Thanks for the suggestions. The problem actually solved itself. When I unplugged my Apple TV, the wireless wasn't recognized so I put it to sleep and woke it back up. When it came back on, the wireless recognized my Mac Pro library. If anyone else has trouble, you might try getting the Apple TV to recognize the desktop by using a hardwire. Then restart the Apple TV (or put it to sleep and wake it back up) with the ethernet unplugged and see if it will show up.
By the way, the bridge mode on my extender isn't a problem. I can hardwire or wireless to the extender router and the IP address on the Apple TV is the same as the host router (i.e., the one that the Apple TV is not plugged into).
Thanks again.
-Andrew

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