Plotter and subroutine depth

Finally i found the reason for preview disappearing sometimes, while program execution. I was watching call level, current subroutine depth, and preview only works with value 0, not in a subroutine.

 

After further investigating, it seems when queue buster, M66 E0 L0  or G38.n is used, makes the preview disappear and sub call level is 1
Most of my routines are used for years, and when there were problems with LOG, and DO / WHILE loop and others, queue buster always helped.

I modified a probing routine for diameter inside, just moving with G1. #<queue_bust> can be set to 0 or 1 , to see the problem

the file example.ngc is used to call example_sub.ngc


 

 

In axis the preview is always there. But axis doesn't update the preview, once gcode is loaded. Typical example in axis, probing or shifting offsets during runtime. This leads to a misplaced trace compared to the originally loaded preview, which persists.
Flexgui does update the plot, if i shift offsets, G10... updates the view.
What i tested, G38, M66 and even my toolchange routine, block the preview until none of the mentioned before is in the further gcode, and then preview comes back.