Cisco :: LMS 4.1 User Defined Groups Empty?

I have seen some discussion in the forums regarding user defined groups being empty in LMS 4.0 but not 4.1.  I am having this issue in 4.1. Under User Defined groups, I have created 2 logical groups named "Physical Location" and "Switches".  These do not contain any actual devices, they are just containers for other groups.  Under the Physical Location logical group I have created 2 other groups, Acuna and Hampton.  Under the Switches group I have also created 2 groups, HDM and HHC.  The criterion for the Physical Location group is based on the first 3 characters of the hostname:
 
Device.System.Name startswith "hdm"
 
The criterion for the Switches group is based on the value of a user defined field, Admin_responsibility:
 
Device.Admin_responsibility equals "HDM"
 
The Physical Location groups work - the Switches group does not.  Both the HDM and the HHC group should contain several devices.  The HDM group contains 2, the HHC contains none.  If I edit the groups and click "next" until I get to step 3, Membership: Edit, the "objects matching criteria" list is fully populated - it contains the devices that it should contain.  However, after I click "Finish" and go to Inventory => Add / Import / Manage Devices there is no change in group membership - the HDM group contains 2 devices and the HHC group contains none.