Group Members report no longer allows selection of a Group

Group Members report no longer allows selection of a Group

Before running the report, I need to select the Group for which I am interested in finding the members. There is a box with the text NONE in it and to the right of this a button labelled "Select". If I click on this button to select the group a dialog window appears with the text "No Groups Found" appears - despite the domain having about 12,000 groups in it!.
 
Other reports seem to work fine, so the credentials being used for the domain appear to be valid.
 
This is the first time that I have tried this report since a recent upgrade to Build 5210.
 
Can anybody suggest what is happenning or how I get out of this?
 
Tony Durrant

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