I never looked at the software that came with it, I immediately upgraded.
Wonder if these guys could help you out?
www.precixpartswarehouse.com/parts-service
Have you tried to contact PRECIX directly? I didn't have any luck, but other have been able to contact them.
Hopefully someone will chime in with some help.
Might want to post on:
cnczone.com
as well.
there are some facebook CNC type groups too, that could be helpful.
Maybe you can find some people who are familiar with the software that comes with it, or the problems you are having. Making jumps and palpitations, makes me think it might be tuning, but I have no idea. Could it be the power supply? Does everything move around freely and smoothly when not powered up?
Maybe you could post some videos of the behavior and someone might recognize the issue?