This might not be related to the issues you're having, but maybe it will help. A while ago I tried to stream Harmy's 2.0 MKV from my laptop to my Panasonic blu ray player, but it wouldn't play. I read some stuff on AVSForum, and used MKVmerge to "disable header removal compression" in the MKV.
I have no idea what that means or does, but it worked.