Guys, as a developer of Canola-UPnP plugin I have some words to say about UPnP:

"UPnP is a crappy bloated %$#& protocol !! "

So, please, don't blame the servers, don't blame the plugin...
The UPnP specification is very week, basically, any http server can fit in the UPnP specification and that's the reason to have 10000 of servers implementations and only 10 or 15 players.

Anyone can implement a UPnP server (even Microsoft) but nobody can create a player supporting all servers (nobody did) .

If you would like to see a better alternative to share your media, try DMAP, or if you don't agree with me, ask to SONY why they are pushing DLNA (DLNA == UPnP + restrictions)...

We (Canola Team) will try to fix all issues with UPnP but this takes time and we need help, so as soon as possible we will publish the source code of the plugin (developers can get using apt-get source) and every user will be able to do tests with your very special UPnP server :-)