Several users in our shop are no longer able to log out of SmarterMail. In addition, drop down buttons (such as Delete, Action, etc.) cannot be selected. We presume there must be an infiltration of some kind, but they have all run cleansing tools and no longer register problems on their computers. Has anyone seen this behavior? Any other ideas how to restore normal functionality? The problem occurs, so far, only in Win 7 and 8, but in all browsers tested (Chrome, Firefox, Internet Explorer), all at the most recent versions.