Laura…Problem is for the moment identified, at least in my case, as a conflict with Contact Form 7 and Page Security for WordPress by Contexture plug-in. If you’re running this plug-in deactivate CF7 and notice that the problem goes away – I have posted a message for the developer of Page Security and I’m waiting for a response. In the meantime deactivate either of the two plugins and the admin menu problem goes away. I’m guessing you will not want to deactivate CF7 though….