I am running BTSync 1.1.70 on my laptop (Win7) and my server (Ubuntu 12.04 lts, with xubuntu desktop). All up to date. I sync data on the laptop to the server (full access share), I never actually modify the files stored on the server from the server side, all file changes being made on the laptop. This means that the laptop has the canonical version of the files. Yesterday afternoon, I powered down the server, and continued to work on the laptop, which ran all night. This morning I powered up the server and BTSync surprisingly pushed changes to the laptop (2 files). This should not have been possible as there was no correct way for the server to have a more up-to-date version of these files. I luckily picked up the problem straight away as the application I was using reported that another application (BTSync) had modified files it had open. I was able the restore the files from the syncarchive directory (which only contained the 2 files in question). This would have been a big problem if I had not detected it. I did not have logging enabled. I have checked the time and timezone on both machines - no problems there. Any ideas what might have caused this?