Some feeds aren't updated after initial setup

I'm having a problem with a couple of feeds. The first one seems to setup correctly with a number of articles, but from then on, they never update. The second feed is similar in that it never updates, but is setup strangely in that only a single article is shown.

1. http://www.vgchartz.com/news.xml
2. http://www.ugvx.com/shout_rss.php

They both work fine with the Sage plugin, but not with Brief 1.2. Any ideas?

Re: Some feeds aren't updated after initial setup

http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fwww.vgchartz.com...
http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fwww.ugvx.com%2Fs...

VG Chartz is using a busted RSS feed. E-mail them and show them what the validator says. UGVX is not using pubDates in it's feed, so it's possible Brief may not see all items in it's feed. They will need to redo their RSS feed it seems.