datafeedr – WP 3.0 problem?

Anyone using datafeedr have a problem upgrading to WP 3.0?
I updated WP and several plugins at the same time. The only thing that worked in my datafeedr site after that was the pages/ all the categories and posts came up as 404 not found. And clicking on home page links kept me on the home page – very weird. Hostgator restored my site, but now I am afraid to update anything.
Anyone else have this problem or know what’s gong on.