stalled job

[tcurdt]

I am running Version 1.4.7 on macOS talking to grblHAL.

I am running a job. I can see movements being buffered (different color in the visualizer) but at some point this stops.
The CNC then catches up and the job just stays idle doing nothing.
I repeated this a couple of times with always the same result.

I then opened UGS and it run the very same gcode file without any problems.