I have just one folder shared across a laptop and two desktop machines. Two machines are running Windows 7 and I am therefore running BT Sync 2.1; but the third machine needs to keep running Windows XP for the time being (long story!) and so I have BT Sync 1.3 on that. All was running fine, the two Win 7 machines upgraded to 2.0 when it came out and all continued without incident. Yesterday I had to reformat and fully reinstall on one of the Win 7 machines. I 'fiddled' with BT Sync without fully understanding what I was doing but eventually managed to get the two Win 7 machines talking to each other and syncing fine. However, I now seem to have broken the link between both of those and the third Win XP machine. Ver 2.1 on the Win 7 machines seems to have a 'key' which is different from the 'secret' in the Ver 1.3 install on Win XP... and when I try to copy the secret / key between the two machines, each says the code from the other is invalid. Any help welcomed here, please