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.

@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.