Falcon2 40watt laser "Passthrough"

Hi , my new Falcon2 40Watt laser will not start to engrave when it is programmed as “passthrough”, the laser goes to the programmed starting point and stops. It will engrave if the image is configured as ‘vectorize’ and ‘filled’ horizontally but I want to laser a photo image in “passthrough” It has the same problem if I pr0gram it for “line by line”
Has anyone experienced this ? If so were you able to overcome it ?