I have recently noticed a strange gremlin in the EE control panel of two sites. When logging in the script will often redirect straight back to the login - as if the session variable is not being created and thus login fails. After a couple of tries it starts to work but then when carrying out tasks in the control panel sometimes the same happens, redirect back to login.
I have upgraded to the latest installation but it continues to happen. Could I have been hacked? It doesn’t seem to happen on another installation on the same server?