Yep, that's exactly my experience (see thread "Four machines, four different counts of files"). At some point BTSync started PingPong with my files. Whatever I did BTSync overruled my will with its own decisions. When adding new files it took some time and they did disappear again. When deleting files it took some time and they came back automatically. Sometimes I had to wait for an hour and suddenly files became deleted or re-created. The share in question was read/write on all machines, standard installation in a LAN with two Windows 8 and two Linux (Slackware) machines. Yesterday I stopped the experiment and did de-install on all machines. It took the whole day today to find out the differences. I don't use iTunes. I doubt that iTunes has something to do with this behaviour. The idea behind BTSync is really great but IMHO the software has a long way to go. And in addition, my 70,000 files exploded from 4x70,000 to 8x70,000 (Metadata) - nothing you want to offer when going GA.