[Xylakant]

Judging from the error description, deleting cookies would likely not help in this case. This sounds as if sessions are mixed up on the server side - deleting your cookie will only remove your session token, not remove the session server-side. You’d need to actually send a logout request to the server.

[hinkley]

Clearing your cookies might mean you won't log into someone else's account, but somebody else might still log in as you.