I've just completed upgrading Community Server, the software we use to run Slashstar, to the latest 1.1 release.
This release brings improved performance and a number of bug fixes, including one for the persistent RSS issues we've had. After the initial upgrade, many of the blog posts were not showing up on the aggregate pages, but this forum post shed a little light on that.
Depending on when your aggregator came calling, you may have noticed a few hiccups, but hopefully we've got a faster and more stable platform going forward. If you are still seeing duplicate entries or encounter any other issues, please drop me a line so I can investigate.
I haven't updated the skins, as I wasn't totally happy with them anyways. Now that I have a bit of time, perhaps a complete redesign is in order. Either way, I thought it was more important to upgrade the underlying platform at this point. I also have to see if my CS Extensions (for example, the search results control and most popular posts control) require any updates. I'll try to clean those up this weekend and release to others as well.
Thanks for the patience!