Hello, all. In typical lame fashion, I figured out (again) exactly what was wrong probably not less than 10 minutes after posting, although after spending several hours fruitlessly just prior. For the benefit of anyone experiencing this:
Basically, this was because the validation scripts located at "\aspnet_client\system_web\1_1_4322" (specifically webuivalidation.
js) were not being found by the web application (sigilent.com) in it's default location off of C:\inetput\wwwroot. I had placed the site's files in a different directory and drive. All I had to do was copy the files in 1_1_4322, keeping the same folder structure, off of the application's root directory, and boom, everything's working normally again...
Cheers,
Allen
-----
mencher cat, mencher cat. boo. cattydear. what a lovely!