Same here – I've not been able to use Sync at all since upgrading to 2.0. I was syncing between a Linux (Mint) computer and a Windows (7) computer. On the Linux machine, I can see 4 peers; hovering over them shows "Read & Write • Classic folder". However, when I select 'Share...' the 'Read & Write' option is greyed out, and hovering shows "You don't have Read & Write access to this folder" (which I certainly do). I have previously (v1.4) been sharing it 'Read & Write', I have never shared it 'Read Only'. On the Windows machine, I can't see any list of peers at all, I have to enter a link key. However I can't – it rejects even the new 'Read Only' key from the Linux machine... Sync 2.0 seems far more complex than version 1 (especially with 'identities'), and worse seems completely broken, for me. I hope I don't have to give up on it and go back to Dropbox. Do you have some instructions for giving up and starting from scratch? The instructions for reverting to 1.4 (on Windows) look horrendous. As far as I can tell I don't want to use identities, I just want to share folders as I did with version 1.