Hi,
I'm just wondering if you were ever able to identify or work around this problem. (?) I don't have much else to add, unfortunately. "UpdateProperties" is indeed the only privilege that I needed at WMX 10 to be able to change the properties of a job.
One long shot idea: the "Save" button at the top of the JTX application should remain disabled until you make at least one change to a job's properties. Once you edit a property, it will become enabled. Could this describe what you were seeing?
Brian D.