There are actually a lot that are in the same boat, but I think they give up like I do, then try again after a few realeases.
The Server and MBC are on the same PC. I am really not interested in running any of the webclient as this is a standalone PC in the theatre room. I am also not interested in running trailers before movies, just now and again, I would like to look at new trailers of new movies coming out.
However, I have tried running it on the web client as you asked and it does the same (although the quality seems like what it should be as set in the Server and is way less that when played on MBC).
So, to recap (on both Web and MBC), it starts to play for about 5-10 seconds (varies as sometimes it doesn't get through the first 5 seconds), then every second it pauses, plays 1 sec, pauses, plays 1 sec. it actually takes twice as long to play a trailer.
I have attached log files if that helps (look for Shaun the Sheep trailer). Hope I attached them right.
I don't mind testing different things.