qidi printer madness, what happened? left head behaves different than the right

[pascal]

All was going well with my qidi tech I, just the other day I aligned the two extruders, and ran the attached script to determine what values in the fw to set for getting the two heads in alignment (following sailfish manual). I don't remember if I printed from the left head since then or not. I tried resetting the printer to defaults using the green with no success.

now I can't print at all from the left head without crazy things happening (s3dn cancel print head tries to go left forever, or RelicatorG print just cancels itself before it starts)

here is a video of the issue: https://youtu.be/2LMjBBUoRSk

in simplify3d:
reset completely, stock qidi tech I profile, adjusted extruder temp and bed temp
right side print of 10mm box - as expected, sweep across the front, goes to printing
left side print of same profile with only change being left extruder selection - head stays to right of bed, sweep doesn't move the head, extrudes into the air, bed doesn't go to the correct height, starts printing, when I cancel the bed goes down, head goes to the left and tried to keep going past the end of the bed & the stepper starts skipping

In ReplicatorG:
right side: lowers bed and moves head at a reasonable rate, warms up and starts printing
left side: bed goes down really slow, heats up, then bed goes up and the printer stops.

I attached the code versions of the files from S3D, printer uses the x3g, but I couldn't upload those. simple 10mm cube.

any help is greatly appreciated!