After updating to latest stable, my entire Passkeeper was empty. Even installing an older version of Maxthon, or the Beta version, would not sync the Passkeeper. I even tried on a different PC - still empty, and when I saved a random account it showed on both PCs so syncing itself does seem to work.
I still have the Passkeeper on the Android version with all my passwords, both desktop and mobile logged in with the same account, but can't figure out why the desktop version can't sync passkeeper.
It also seems to have rolled back my bookmarks from awhile ago, probably some sync issue from me not updating the browser in a long while, but the passwords are still on mobile which is odd, even when resyncing.