When logged in and viewing site grey admin bar blocks site menu

When I’m logged into the admin and go to proof the site I now get an additional admin menu – dark grey bar that should sit above the site content. But instead it sort of hovers about an inch from the top overlaying the site’s navigation. I think I might have some css conflict but is there a way to simply turn that guy off – and have it work the way it used to (while proofing you simply saw the site like any non-logged in user)?

Thanks so much for any guidance.