On my Ubuntu 12.04 server, if I unrar to my btsync folder, btsync doesn't start the sync. In fact, it seems that no matter how long I wait, it never starts (did a 15 min test just now). However, if I touch the file after it unrars, btsync notices it and immediately syncs it. If I unrar to a different folder and move or copy it to my btsync folder, it begins syncing immediately. I've yet to try unrar'ing one file to the btsync folder, watching it not sync and then later copy a second file to the btsync folder. I wonder if both files will then sync or just the 2nd one. Is this behavior expected?