To enable debugging see here http://kodi.wiki/view/Advancedsettings.xml#loglevel
I deleted guisettings.xml and pi boot into default osmc skin (with all gui services disabled). Trying to enable Upnp share results in sad face.
Here are logs:
http://paste.osmc.io/ulukuhabus
There is another thread about upnp problems after this update.
So, skin reset only allowed me to stay on GUI. Upnp sharring is the problem.