I was able to "restore" my pre-update session, but I do not know if this will work for everyone.

1. Open Opera and type opera:about/ in the browser.
2. Check the Profile path and go there. It would be something like C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable
3. In this folder all your previous browser data is still there.
   The problem is that the new update created a new folder called Default so you have C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable\Default and Opera is extracting all the browser data from this new folder. This is the reason why there is no history, extensions, speed dials, etc.
   As there is nothing stored in this Default folder, is as if you just installed Opera and opened it for the first time.
4. You can copy (and backup) all the data from C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable and paste in the Default folder C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable\Default

Hope this help you!

I was able to "restore" my pre-update session, but I do not know if this will work for everyone.

1. Open Opera and type opera:about/ in the browser.
2. Check the Profile path and go there. It would be something like C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable
3. In this folder all your previous browser data is still there.
   The problem is that the new update created a new folder called Default so you have C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable\Default and Opera is extracting all the browser data from this new folder. This is the reason why there is no history, extensions, speed dials, etc.
   As there is nothing stored in this Default folder, is as if you just installed Opera and opened it for the first time.
4. You can copy (and backup) all the data from C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable and paste in the Default folder C:\Users\your_user\AppData\Roaming\Opera Software\Opera Stable\Default

Hope this help you!