same for me which is why I registered here as this drives me crazy. It worked like a charm in version 5 but since the forced update to 6 there are errors all over. I really question if somone is testing the software as we hear since Version 6.0.1 that it should work now.
With iOS you can somehow sync if there is no vault on the webdav directory yet. Somehow because the sync page says "Last sync at hh:mm:ss" (put any time you want as it is updated every 10 seconds or so). This was not the case in version 5 and it is not if you use iCloud to sync. Beside that it's not working