Admin mode is surprisingly lost

Had Grafana Running for several months, worked fine. Checked out Grafana after longer absence. Was able to login with admin credencials, but was unable to edit anything. Seems to me that it was a User View instead of admin mode. Logfile login was okay but showed: t=2020-05-11T08:36:02+0200 lvl=eror msg=“Failed to look up user based on cookie” logger=context error=“user token not found”. Version is 6.4.3

Okay found out that it had something to do with the cookie_samesite setting. Needs to be set to disabled instead of none to work with newer browser versions.
I changed this setting months ago, but was still signed in.So I guess the issue took place after the cookie has expired.