Just a little heads up for those using some buzz boxes (possibly others).
On my U5, I was going through my "favorites" and saw many streams were not working. Found it odd, since they worked on my other boxes. Then I realized that the channel list was not updated (guess it was cached and did not trigger a refresh), since I noticed a channel in one of the categories that I know was dropped. Did a "refresh" from the menu, and all the streams now work.
So if you have a lot of streams that are not streaming, ensure to do a refresh before assuming it is the server.
BTW: Not a big deal considering all the previous instabilities, but "CA: Cooking channel" is streaming the "US: Cooking channel" stream.