Related issue -- Safari on my Macbook just stopped me from staying logged in. I login, return to previous screen logged in, and then as soon as I click a link I am logged out. Firefox works great....
I just realized that this is the only forum that does not let me stay logged in while using Safari....but does let me stay logged in when using Firefox. I also use the St Louis Brews forum which is phpBB and have no problems in Safari.