Having similar issues to those posted here. Synch process takes about 30 minutes to get to the point where I get a message saying there's a problem with the synch and to try later. I have 1860 people in my tree. This wouldn't be so bad if there at least was an option to cancel the process once it has started. It seems a bit unreasonable that you cannot cancel (button is greyed out) before 30 minutes. I will try again in a few days, but to be on the safe side I will make updates online only.