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@leocg Thanks a lot!
I renamed the Extensions folder and restarted Opera. Most of the extensions were broken, but I could open the tab for them. I deleted three extensions that I suspected the most, closed browser again, renamed folder back to Extensions, opened browser again and everything works fine (including Speed Dial) 
When I opened my browser today I couldn't access my Speed Dial page. It's just an empty white page and on the tab it says "Loading..."
So I thought one of my extensions might cause some issues suddenly, but I can't access my extensions either. When I click on the Extensions button it opens another empty white page and on the tab it just says "Untitled". Extensions bar is empty as well. My extensions do work though.
Is there a way to deactivate extensions manually like deleting some files in the Opera folder? Or any other ideas what can I do? Thanks in advance.
Copied informations:
Version: 50.0.2762.42 (PGO) - Opera is up to date
Update stream: beta
System: Windows 7 64-bit (WoW64)