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@toninho3rd said in Opera is not keeping any site logged in:
toninho3rd
After going back to version 50 all was OK. Shortly afterwards it automatically upgraded to version 51. Everything was fine for a few days and then the problem reoccurred. Forcing an upgrade to 51.0.2830.34 (using About Opera) seems to have fixed the issue again. Hoping that's the last of it 
I am also having the same issue with GMAIL and other sites (but they are not so annoying). The problem occurs with Opera 51 on Windows 10. It does not occur when I go back to Opera 50 on the same machine.
I deleted *%appdata%\opera software* and that had no effect.
I reloaded a backup of *%appdata%\opera software* and that had no effect.
I have moved back to Opera 50 and all is back to normal.