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[Beej]

Thanks to XPS for the support and thoughtful, timely responses. Problem solved by using the S.Bus to program the slave (in this case) to "R" not the XPS 24. That is, when matching the master and slave were set to "N", and then no problems. Probably not relevant to many people except to those who are setting up dual servos on either side of a direct drive rudder where, in effect, the servos are rotating in opposite directions. This may be a quirk of the Futaba S9177SV servos and their interaction with the XPS 24 but nonetheless this is what worked.

best

B.