[Elecraft] [KXPA100] PA goes to TX when KX3 set over 10W

[Al Duncan VE3RRD]

I have noticed a problem with my KXPA100 since I upgraded the KX3 to 
v2.76/1.50 firmware. My KXPA100 (with built-in tuner) has had v1.39 
since it was released as production firmware.
When the KX3 is set to 10W or lower, the PA "ON" LED flashes slowly 
indicating that the PA is bypassed; but as soon as I increase power 
above 10W, the KXPA100 "TX" indicator goes on and the KX3 receive is 
muted (the KX3 is not transmitting).
When I check operation with the KXPA100 Utility, there are no faults 
indicated; and the Bypass mode clears above 10W (as it should).
I have reloaded the PA with v1.39 again but no change. Everything was 
working OK prior to upgrading my KX3 to v2.76/1.50
Has anyone else experienced this?   AL - VE3RRD