OK, I tried several different feeds from different sites and it didn't work. I decided to test by using your news rss feed. I placed the block on the home page and it loaded. Next I created a block on the profile page and put your news rss link in and it loaded. Therefore, conclusion is that it could be the nature of the feeds that we are trying. Normally I see rss and xml listed; haven't tried xml. It could be that it isn't loading because it can't understand the rss feed url.
Update: I found a news feed that worked. So it isn't anything with Cheetah or the server; you just need a proper rss feed.