No thumbnail on some dials in Firefox on Android.

I have installed Speed Dial in Firefox on Android and then restored my dials from the server. Some of the dials do not have a screenshot and show only the throbber. I have tried to manually refresh the dial, restore from a .sd file and also restore from the exported text that Speedial creates on it's first setting page. I have also tried to delete the existing dial and recreate it. I still get the same throbber.

Less importantly, the URL is now mox-ex://hdsjadhwjqhdjhr832478374 ... it used to be a nice fvd:// is there any way to restore that?

Does anyone have any ideas how to fix these issues?