ITunes 8.2 no longer sees 2 Apple TV devices until...

Hello,
I've seen many posts over the months about people having problems getting their Apple TV to connect with iTunes. Until this morning I thought that I must just have things "set up right."
I updated to iTunes 8.2 shortly after it was released. I don't know how long my two Apple TVs have not been showing up in the sidebar. This morning I noticed it because I bought some songs off the iTMS and was unable to right-click on my main music Apple TV (a 160 GB model). The 40 GB one connected to my HDTV is also AWOL. They both were still in my Apple TV Preferences panel and both said "Syncing" in the status column. Both Apple TVs still have network access as does the iMac. I have an Apple Airport Extreme Base Station with Gigabit Ethernet.
Here's everything I tried, in order:
1) Restarted my 24" aluminum iMac with iTunes 8.2 and OS 10.5.7
2) Pulled the plug (i.e. rebooted) both Apple TVs
3) Told iTunes to "forget" both Apple TVs.
4) Told the 160 GB Apple TV to "forget" my iMac's iTunes.
5) Updated the AEBS to the latest firmware (7.4.1)
6) Told the 160 GB Apple TV to connect to an iTunes and noted the 5-digit access code. iTunes on two different computers running 10.5.7 and iTunes 8.2 fail to see the Apple TV in the Preferences panel. The "Look for Apple TVs" checkbox is enabled.
7) Restore factory defaults on the 160 GB ATV and reattach to the network. Step 6 failed again, same symptoms.
8) Downloading the latest ATV software to update the 160 GB ATV again. Repeat step 6.
Now, miraculously, both devices appear in the sidebar in the un-set up state with the name "Apple TV." Great. I get to resync 100 GB of music and video. That ought to saturate my poor network for a couple days. I hope this never happens again but somehow I suspect that I have joined the significant percent of ATV users with problems like this.
Feh.

Hello OptiClaus
Have you tried the troubleshooting Home Sharing article below? If not, it may help you out getting video to start working again.
Troubleshooting Home Sharing
http://support.apple.com/kb/TS2972
Regards,
-Norm G.

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