[xwiki-users] RSS works only once ...

I have made the changes proposed by Anca Luca, but the RSS feed does not update itself! If I subscribe to the feed I see the latest changes, but the next changes never appear. It is as if the feed works only the one time that it is imported in the reader (and I have tried two readers) and not afterwards ... Any idea? Without RSS notification, my whole project goes down the drain! Xavier