Isn't the Combo 6010 and Smart 6000 the same machine? Excpet for the trigger on the string gripper on the Combo 6010.
Aside from your major fault of using the tensioner to pull knots. I assume you were trying to over tension the last main or cross to tie off, which is OK. It's called the "Knot" fuction on some machines, but was not intended to pull knots.
I guess you seemed to have fix the problem, by re-calibrating your machine.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual