Hi Carlos,
Regarding:
#1 I think what is happening is this scenario reaches your Max Output (correction) setting or Max Integrator setting. What are yours set at?
When you disable the amplifier and create an error the Integrator will start ramping the Output position correction to correct the position, but because your amplifier is disabled it ramps up forever with no reduction in error. Once it hits the programmed limit it will stop making correction so then once you re-enable the amplifier it will remain where it is. Try setting your Max Integrator and Max Output limits to infinity (1e30).
#2 We need to add an option to display Encoder position rather than Commanded Destination. Any preference on how to select this in the GUI?
#3 - regarding Tangential knife: I understand it works in Mach3. That is all transparent to KFLOP. With KMotionCNC it is performed with a C program. There is an example at
http://dynomotion.com/Software/CPrograms/Tangent.c
Regards