Qidi Tech 1 - Replicator 1 clone

[dibble]

just got a Qiditech 1 unboxed yesterday. I use Simplify3D on Macos (11.11.6 el capitan) with my other printer so I didn't bother with the maker software. Fired up S3D and everything looked good. But, sent the first job to the printer over USB and only the right extruder heated up. The left and the bed just sat there cold until the unit timed out with some tones and read 2% on the screen. Never did anything after that for 30 minutes.

After chasing a few wild geese and confirming the unit wasn't DOA I finally decided to save the same file to SD and it printed fine.

Is there an issue with S3D and USB to this printer? Or is there a setting I'm missing somewhere? I've played with a couple of the GPX profiles under gcode tab of S3D, but nothing hopeful yet.