After thoroughly investigating a trouble report from a user this week, we've discovered a bug which causes Error 651507 Timed out waiting for import, if a bookmark name contains certain very rare unassigned invisible characters.

This bug is now fixed for the next version, BookMacster/Synkmark/Smarky 3.1.7.  Until 3.1.7 is published, if you experience a repeatable Error 651507, contact us by email and we'll send you an advance copy of 3.1.7 or something.