CQ logs in straight into the welcome screen as the wrong user with Firefox
We are currently using CQ 5.4 (in the plans of upgrading), but some of our users are finding they are opening Firefox, then going to CQ author, and being logged straight in, but with the wrong user details. This doesn't seem to occur under IE or Chrome. Anyone else experienced this or know of a hotfix? If users go to the SiteAdmin it then says the user is Anonymous and doesnt display any sites. The issue doesn't always occur even in Firefox
I did notice that the login-token cookie does not seem to be being created under Firefox, but I would have thought this would stop login at all. How its allowing users straight in I have no idea.
Any suggestions appreciated