lost the tool bar on the front end.

I have lost the admin tool bar on the front end. I think it happened with an update but i may have changed an option that turned it off. i have been trying to turn it back on with no luck. i have turned all the major plugins off trying to find the problem.

I am using wp mu 3.3.2 with buddypress, pro site, and members.

note i lost the admin bar on all sites.

looking for some direction as to where the problem could be.