Lots of people having mediashare problems with this release, it seems to be pretty well broken.
There are still problems with mrv pausing the transmission of packets, so occasional glitches are still happening and no amount of network fiddling will help that.
On the other side of things, if you're running a wireless or powerline network and getting a lot of glitching, you probably need to pull a wire or buy more expensive wireless or powerline setups. Sometimes even dual band wireless N or 200Mb/s powerline isnt good enough.
Comparisons with other network related applications working fine when MRV doesnt also isnt much of an indicator. Most network apps arent dependent on a fluid, unbuffered 12-15Mb/s real time data stream. MRV is.