Our HTPC is a client, uses authentication, and generally, syncs just fine. I've found a lot of missing playback data though...
Thinking... We watch a film before bed, it ends, HTPC is put to sleep. I know for a fact that this has given it no time to sync back to the server, but also know that if we wake the HTPC the next day, the data is then synced back to the server.
Often, it can be many days, sometimes a week even, before the HTPC is called upon again, and I surmise that this is when the data is lost. Is that reasonable? Is there anything I can do other than obsessively check the server for updates from the HTPC before powering it down? (Who wants to do that??)
-marko