Why did Home Sharing suddenly stop working for PC libraries?

BACKGROUND: Ecosystem consisting of one PC with medium-sized iTunes library (7,000+ songs and 3,000+ photos), 2 Mac Minis, two MacBook Airs, Apple TV 2, Airport Extreme Base Station, Airport Express in extender mode, Windows Home Server 2003 with iTunes server module, iPhone 4s and iPad 2.
All the latest updates installed. Airplay, Photostream, iCloud and Home Sharing all installed and everything working happily, as advertised. I've had other issues, like everyone else, but Home Sharing has worked pretty much without fail for as long as I can remember -- years.
THEN, SUDDENLY: On the evening evening of Sunday October 23, 20011, Apple TV stops seeing "Arthur's Library" -- my main library, located in the latest update of iTunes, on my PC.
AND IT VANISHES ELSEWHERE: I click on "Arthur's Library" and the B&W "wheel" ground for about ten seconds -- then the library disappeared. Figuring it might be an Apple Tv issuem I opened my Air, loaded iTunes, attempted to load "Arthurs Library" and the same thing happened. Library just disappeared.
So I go to my PC and fiddlewith iTunes.
Turn off home sharing, reboot for the heck of it, turn home sharing back on.
And the library reappears on Apple TV and other home share devices...
Only to DISAPPEAR when I tried to load it, exactly as before!
So I dutifully go through all the other trouble-shooting steps suggested by the oft-quoted Apple Support article, plus some others:
1. I turn off photo sharing, because I had been doing this over the weekend, just prior to failure of home sharing. No dice.
2. Power off both routers. Wait. Restart. No joy.
3. Check firewall settings. All as they should be,
i
* I kind of doubt it's a router issue, because home sharing works just fine with the Macs.
* Kind of doubt it's an interference issue, because Airplay from my iPhone and iPad to the Apple TV works like a charm.
* Can't think of any updates of any kind installed in between "all systems go" and "FAIL"
ANOTHER CLUE? The little "Airplay" icon that normally appears in the bottom right-hand corner of ITunes on my PC has disappeared. So maybe the issue is BONJOUR? Okay, I go into Services, and Bonjour is running. I stop it, restart it, then restart iTunes on my OC, ditto on my MacBook Air. No joy. And now, as I'm writing this, I notice a...
SECOND MYSTERY! Suddenly, my Mac can't load the library from my Windows Home Server 2003 installation, which has NOTHING TO DO with Home Sharing. This thing has ALWAYS worked everywhere before. Now the wheel just grinds endlessly, whenever I try to load the library on my server.
I'm out of my depth, guys. HELP! And thanks in advance for your time and advice.

Well, the first problem resolved itself just as mysteriously as it arrived, spurred perhaps by yet another Windows patch or Who Knows What. The second problem persists. Suggestions?

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Why did Home Sharing suddenly stop working for PC libraries?

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