Problem - Cannot set Required Approvals for a work item

Hi all,

I'm configuring a fresh install of RTC 4.0.0.1 from my Eclipse client on Win XP.  I am attempting to create  Approval Tasks with one or two approvals mandated, but merely creating a new work item type seems to affect Operation Behaviour. 

What I see is that I create the work item type, category com.ibm.team.workitem.workItemType, with no workflow, and add an E-Signature attribute.  I then go to Team Configuration/Operation Behaviour/Save Work Item(Everyone) and add the precondition Required Approvals.  I see my work item type in the list, but cannot edit it, or indeed any of the other work item types that don't have a workflow associated.  Before I added the new work item type, I could expand the work item types in the list and set required approvals on the various states.

Something is clearly wrong with either RTC or me but I can't work out what.  Amending permissions to ensure Everyone can save work items makes no difference.

If anyone has a clue as to what's going on I'd be glad to hear from them.
Thanks -
Cliff