Feed pages appear & disappear erratically

Hi,
I’ve successfully setup wordpress and its been working great. However, I’ve tried setting up a feed reader from the rss link on the pages, and I’ve noticed that once I set it up in explorer 7.0 or outlook, the feed page becomes blank as soon as I access it again. It appears as soon as I post something to the blog! Any ideas as to what is going on?

Thanks!
Maha