had a similar problem, maybe it's the same
the program seems to be crashed, and I wait a really .. really long time, I'm sure i have over 4k bookmarks, 1k+ speeddials and other saved info, so after sometime passed.. more than an hour or even much more, the sync is finished, next time it starts in a normal way, just as before
i donno what is causing it, because this never happened before version 62
@phoenlix I believe workspace feature and my flow are both still can be develop to something more. maybe they opera developers make them work together or something. I don't know. but for now both features are really cool but they are very unfinished in terms of functionality. I would also like to see some auto-tab-hibernation feature...