DCM 3 - Display Inventory

Hi, I'm hoping someone can help.

Across all of our Optiplex systems none are reporting their Display Inventory.
In the local event log this is displayed on the detection process

0011: The following display assets have been discovered on this computer -

1. DELL E248WFP, ID=DELA02D, S/N=xxxxxxxxxxx, Age=6851 hours

Display asset attributes have been written to c:\program files\softosd\softosd.mif

If I run the display inventory task it fails with the error Unsupported device.

Hope someone can help with this.

Many Thanks

John