This is very strange, but I also have noticed a sync failure in the last few days, with very similar symptoms (possibly identical) to the OP’s. DEVONthink Pro on an iMac claims it’s synchronized, DT on a laptop claims it’s synchronized, and DT on my iPad claims it’s synchronized, yet they are clearly not showing the same content. I’ve been stumped for the past few days. Up to when I noticed the problem, sync had been running flawlessly for me for years… I was about to try “clean database” in the sync preferences, but didn’t know what that did (it’s not documented in the manual), and a search of the forums turned up this thread. Glad/not glad to see maybe I’m not alone with this issue…