I had to change the insync folder on my machine. I moved the folder, started insync and tried to relocate the sync-path in the account settings. It complained that the folder already existed and wouldn’t start to sync. Also tried to change the folders name without success. Finally I logged out and logged in and then I could choose the right folder. BUT now it duplicates and resyncs files and folders that are already there. This is not the first time insync does that. Have also happened when setting up insync on a new installation.
I am using Ubuntu Xenial but the problem has also happened on Mac OSX Yosemite.