not sure I understand dreamstone ... based on what you write, this could be happening;
1. you enable autoptimize
2. you go the your site
3. you see the adminbar
4. you disable autoptimize
5. you don't see the adminbar
but is autoptimize isn't activated, it can't be the reason of the adminbar not being visible, so I guess I misunderstood? Can you explain some more?
frank