Same problem here. I was able to sync previously. I had to re-install windows 10 on my computer and the re-installed Opera, but I cannot sync. I even changed my password twice. I get the Synchronization message "An error occurred during the log-in process. please try again." I've tried to sync many times, but it's just not working. I was really getting used to the browser, but I may have to fall back on Firefox. Anyone on the board know of any fixes? Thanks!