Network binding, responsiveness
The first is the server's binding strategy. It took me several hours to figure it out, but I did eventually. (Thanks for the logging facilities.) It seems serviio can receive playback requests via all NICs but can only serve them on one, the one its bound to. I have several NICs (Ethernet, Hamachi (LogMeIn), Gbrige, VirtualBox, etc.) and serviio decided Hamachi was the one to use for default. My suggestion on this is to change this strategy so that the default binding is IP 0.0.0.0 and then serve the video via whatever NIC the request came through.
The second issue I've noticed is that the responsiveness while navigating the menus is pretty poor. It takes 1/2 to 1 second to respond to each command and it won't accept further commands until it has responded. (This seems to only happen during folder/file navigation. Video play commands have a snappy response.) In comparison, Samsung's AllShare software appears to have no noticeable delay.
Otherwise, great software. I especially like the trans-coding and the predefined profiles.
My equipment: Windows 7 Ultimate, Samsung 6030 TV (UN40EH6030FXZA), 100BASE-T ethernet in between.