Well… it fixed itself temporarily, and then it broke again.
Yes, the validator still claims that the there are neither errors in my site nor in my feed; however, if you click he subscribe button, it’s quite clear that something is broken.
This is further evidenced by Google Webmaster, which also cites that the URLs are broken.
Anyone have any ideas what I’m supposed to do. Google webmaster says that there are errors on lines 12 and 13.
Thank you.