Yes, it happened automatically when I shut down, or automatically on startup if I had abandoned synch on shutdown, which I had to do lately because of repeated failures to synch. I was also in the habit of regularly manually synching throughout a session.
On FTM startup just then, it tells me that I am not uploaded and linked - aaggghhh!!! I did not unlink it. My right-hand side bar indicates that it IS synched.
Tried compacting again last night - hung up half way through and after several hours of being hung I cancelled it. Other issues too but the synching is the main frustration.
Any advice very welcome!