RSS not working

Hi there

I set up a new WP installation and imported all my content form an old installation.
Permalinks are working and blog should show the whole articles in the RSS-feed.

URL.ch/feed/ isn’t working – feed won’t be recognized. Google Reader (and several other feed readers) can detect the feed but only show the title (no content, no exerpt) and links to the original blogpost are corrupted.

Any hints what the problem could be?