For those of you who are still disappointed with the new Opera Browser 10.5x, I advice you to go back to Version 10.10.

But than you have to turn the auto update „feature“ off. Otherwise it will happen that you start your PC just to find the crappy 10.5x version back on again.

Tools > Preferences… > Advanced > Security > Auto-update and choose „notify my about available updates“ or „Do not check for updates“