All other functions of the Admin Console seem to work fine...
Developing & managing programs. Creating, managing, and controlling devices & scenes, etc etc.
Actually, I suppose there are a few odd behaviours...
1.) When linking to new devices. At least some of the time, when I add a New Insteon Device, or a new scene, the new device or scene doesn't immediately show up under the Network > My Lighting tree view. I've had to clear the Java cache and re-launch the Admin Console, at which point the new item/s appear and can be managed as expected.
2.) Sometimes, when I launch the admin console, device/s appear with exclamation-point icon/s, instead of lightbulb/s. But it doesn't prevent them responding correctly when I select them and click an 'On', 'Off', or other control button. Just the icon is not updated correctly.
3.) And I wrestled for some while trying to get the ISY to use my ISP's SMTP server (DSL=Qwest, and ISP=MSN/Live.com). I eventually gave up, since others on this forum have had troubles getting certain ISPs (live.com among them) to play nice with the ISY. I switched to a third-party SMTP server which I also have an account with, and that works fine.
I've been assuming that these effects were merely bugs in the interface etc.
I don't see any obvious connection between my Event Viewer issue and any of the weirdnesses that 1, 2, or 3. I just mention them in case there's some not-so-obvious connection.
The ISY and my WinXP box are both static private IPs (192.168.168.xxx) on my LAN, so there's no router or firewall to traverse in between them. Both plug into the same ethernet switch. I've not observed any (other) connectivity issues on the LAN. Since the Event Viewer does not display ANY events in its window (not ever), it doesn't suggest to me a sporadic flaky network issue. But, to be fair, I have no alternate theories to explain the behaviour, so I'm not ruling anything out.