X3 Shortcut Key Issue

Control M shortcut key does not consistently work in EndNote X3 for show all references.  If I restart the computer and open EndNotes, the key combination works.  However, when I close EndNotes and reopen it and try the same thing, the key combination no longer works.  This had worked fine prior to last week.  I had a hard drive crash, reinstalled EndNotes on a new hard drive and reinstalled Office 2007.  Any idea what might be going on?