Invalid Argument when selecting Queues

Hello. When selecting Queues under Workplace in CRM 4.0 as user A, the "Invalid Argument" error message appears. The security role being used by this user A has read access to the Queues entity, so it does not appear to be a permission issue. Testing user A with the System Administrator Role displays the Queues, but copying the System Administrator role and creating a new role (without changing any settings under the System Administrator Copied role) also shows the "Invalid Argument" message under Queues with user A.