This is what I use to sync form the iMac to the Samsung TV.
They do have a new version which fixed the issues with MKV.
Tried it the other day, and the film played fine.
Of course, the TV's own DLNA has some issues that no server software can fix, which include the lack of true fast forward and others.
I've tested a lot of DLNA servers for windows, linux and mac. Some worked, some didn't... but the ones that worked, with the exception of Samsung's PC Share Manager, none of theme were able to play MKV HD files on my TV. With some servers i get "Not Supported File Format" error message, with others i am just dumped back to file listing without any message. Anyone can tell me why is this happening or what else should i try? If i use Samsung PC Share Manager everything works... but with other DLNA servers MKV streaming to my TV doesn't work... so i think it is just a software problem...