Downloaded latest update now laser disconnects on Send

After updating to the latest Lightburn version (0.9.24) I tried to send a file to the laser via USB cable from MacBook Pro. The laser is a red-and-black Vevor 80W CO2 laser with a TopWisdom controller. My licence is current
When I try to send the file Lighburn tells me the laser is disconnected. Yet I can control Home and Go to Origin, so something is connected.

Resolved — turned out to be a problem with my file, not the software