Create Endpoint Client Install Package

I am trying to Export a Client Install package  12.1.671.4971 using Symantec EPM.  It starts off gets as far as 'Retrieving the package data from the Management Server' and never finishes.  I have selected to create a single .exe and tried without that checked.  It does create the folder and some files & folders in that foler but just never finishes and eventually just goes back to the log on screen.  I have been able to create install packages in the past on this same server.    I have done a install/repair of the Endpoint Manager and still get the same result.  Any ideas on what might be causing this problem would be appreciated.  I need to get an install package created for some new 64bit workstations. 

Thanks in advance

Art W