RSS feed broken


I have two domains on the same wordpress install: and

The feed is totally broken while the feed is working perfectly ?!?!?!

I tried to update the theme but besides breaking totally my layout it did not solve anything. So i rolled over the version i had earlier.

Now I wonder where this could come from as because of the fact that has its feeds working well i do not understand that is broken.

Any hint ?

PS: I disabled all plugins and it did not change a thing either