Hello,
Could you write me email and describe what exactly happened?
(admin@fastaddons.com)
The update was released already 10 days ago, it's highly unlikely to be related, also there would be much more reports.
Check if there is "Old Firefox Data" folder on your desktop, it's possible that your Firefox was refreshed.
Also, I've wrote an article that could help you recover your dials:
https://github.com/fastaddons/GroupSpeedDial/wiki/Recovery-of-your-dials,-how-are-dials-stored-and-how-to-make-a-backup
Best Regards,
Juraj Mäsiar