Cannot export with current versions

Firefox 52.7.3esr, Windows 10 pro

I had a backup from 4/23/18.  But I just today did a password change and discovered that currently I can't export using v4.21 and previous versions back to v4.16. 

At that point I installed v3.5.23, imported the 4/23/18 backup, updated the password, and then was able to export it normally.

I noticed that the release notes on the last 2 latest versions include "fixed export bug", but I'm guessing that's referring to "Export not prompting for a file location" ?




Sorry, my mistake.  The problem was caused by Ninja Download Manager.