Aggregator in 6.12 kicking back URLs...?

I'm trying to set up the Aggregator module in 6.12 on Linux, and am having a problem getting it to set up a new feed. The error I keep getting is:

The URL http://p.moreover.com/page?dh=earliest&wiz=2390512&c=3G%20and%20GPRS%20news&r=1|2|3&relf=2&o=rss002 is invalid. Please enter a fully-qualified URL, such as http://www.example.com/feed.xml.

I have used feeds from Moreover before using lastRSS on another site I built (www.autorazzi.com) with no problems. The URL returns validly-formed RSS data (tested it in IE8, Thunderbird, and Firefox).

Any idea why the Aggregator module is kicking it back? It looks like a valid URL to me, and none of the browsers or RSS readers I have access to complain (although I understand most have some ID10T heuristics built in to accomodate error-prone, simple, carbon-based lifeforms).

Thanks!

-R