crazy Preview layer height

[almendsr]

I'm getting some really crazy MAX layer heights in the preview mode on the slider. 10's of thousands when the model is only a few mm's thick. I'm using v4.1.2 (Win10). Did I bump a setting somewhere?

[S3D-Alex]

It sounds like the Preview Mode slider is set to Lines and not Layers. lines will preview the file by each individual line of gcode. This is found in the Control Options section at the bottom of the Preview Mode.