Hi Dennis,
Those features should work. The way slaved axes work wih KFLOP is that KFLOP does the slaving. From Mach3's point of view the slaved axis doesn't even exist. It just moves the X axis and KFLOP causes your A axis to follow.
The A axis shouldn't even be defined in Mach3. Also in KFLOP the DefineCoordSystem should not include the A axis.
So I'm not sure what is going on. Somehow the A Axis is de-slaved or maybe just disabled somehow.
Can you give more information?
Regards
TK