Camera control trace not working

When i click Trace in camera control all i get is line box in red.
When i first run Lightburn worked ok. Now it dose not.
Useing Arducam ZMX179 Camera on Snapmaker 2.0 with 40 watt laser
Tryed 3 other computers works fine first time then doesn’t work.
3 of the computer have there own cameras internally, same thing happens.
Roy

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