Sorry for delay, been away. my setup. I have a raspberry pi setup with btsync v1.2.82 on it and an external HDD with my FULL backed up copy (yes another copy) of the lightroom catalog and photos. This is then synced (one-way, read-only) to my windows 8.1 pc at work. So on neither machines lightroom isn't installed (raspberry pi, home/windows8.1, work pc) As mentioned it seems to sync everything else, photos and if i create a file in the same directory as the lightroom catalog it will sync that. I have even tired re-creating the sync and re-indexing it, but it doesn't pick it up. Have also tired deleting the lightroom catalog (work pc) but it doesn't re-sync it. How do you turn on debuging in linux and windows to see what is going on? Matt.