We had the same problem, the issue seemed to be occurring because of the Email window (on the left hand pane) constantly refreshing a copy of the user's Outlook profile. We did upgrade to Max 15 and changed the settings so the Email window was hidden, and to Maximizer using it's own compose window to send the messages. We also had to give all our users admin rights. This combination has worked very well in stopping the application from freezing. We are also using Windows 7 and Office 2010.