It seems there is a new option in Opera to hide the Speeddial.
Im from Germany and my speeddials disappeared after updating Opera 2 Days ago. I found out that there is a new option under the advanced tab and then go to startpage settings, there u will find a setting: hide speeddial or equal ( i have the german version).
This setting seems to be set to ON after update on opera, i changed it and boom back are my Speeddials. But still there is one more problem, after closing opera and restarting it the setting switches back to Hide Speeddial.
I hope this will help a little.