The latest release of Portable UPnP SDK contains several bug fixes and support for large files.
You can get it here:
http://downloads.sourceforge.net/pupnp/libupnp-1.4.2.tar.bz2?use_mirror=osdn
The changelog can be seen here:
http://sourceforge.net/project/shownotes.php?group_id=166957&release_id=483279
Enjoy!