OK here is an update that may help other windows users: The windows version looks like not working OK (with several nightly versions i did try). Could not define number of sources, could not add sources info.
After a day trying, i realized this must be a problem of SKIN compatibility. The problem exists with the new Krypton default skin (Estuary)
Easy "fix" (until alpha builds become more stable?) = Download the old default skin (Confluence) and addon works fine