@leocg I can't clean my profile as I unistalled opera from my computer. However, I installed a "cleaned" install by following these instructions :
1.Go to www.opera.com/download.
2.Click to download the newest version.
3.Select "Run" to start the installer.
4.In the installer, click "Options".
5.Change "Install path" to a location you have write access to (do not use "Program Files") and make a new folder with a name you'll easily identify, for example: "C:\OperaTest".
6.Change "Install for" to "Stand-alone installation (USB)".
7.Click "Accept and Install".
It was working until I start the synchronization... every time I open browser it shuts dow after several retries.