That most likely has to do with conflicts with scripts or other plugins…I would recommend opening up Firebug or something simlar and tracking down which scripts may be interfering or causing errors that are preventing portions of the AAM to work correctly.
You may want to try deactivating all other plugins to see if that removes the conflict and if it doesn’t, try switching your theme back to twentyten, twentyeleven, or twentytwelve to see if it is possible that your theme is causing the error.
Hope that helps!