Thanks, thn788 !! That half way fixed the arb. Ultra Station will now transfer to source1 but not source2. v00.02.03.SP5 is probably an interim bug fix since Rigol NA hasn't been given notice of it. At least I can transfer to source1, save a copy on the scope, and then load manually in source2.
Rigby, see attached. Grab a copy of the DG1000Z programming reference. It looks like Rigol did a partial implementation of it for the DS1000Z-S and DS2000A-S arb's.