Hello,

In urgent cases like this, please contact me to my support e-mail (I'm trying to reply asap).
This issue was caused by a rare Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1478602
And it should be fixed after upgrading to the current version 10.0.
Also your dials are not lost, only thumbnails are not visible.
And to prevent loosing your dials, make sure to either create a manual backup in the Options page or by creating free cloud account.

If the problem does not disappear after upgrading to version 10.0, please write me!

Best regards,
Juraj Mäsiar