When you set this value, it should have set the expiration time of the cookie that got set to 86400 seconds in the future. Are you able to check the expiration time of the cookie that gets set?
I tried it again and it worked this time around. The problem earlier was that the cache's ttl was a higher value than the session lifetime.
I love Tango - especially how easily I can create secure WORKING forms with it... it's the best I've encounted - and I have tried many, including some big names.
I do have another question: by default the login has 'Remember Me?' already selected. How do I change it so it's unselected?