Rick,
Thank you for your reply! I uninstalled and reinstalled Lightburn, and now everything seems to be working fine. I will report any further issues, if I experience any.
For the sake of answering your questions, I am using a direct USB cable from the machine to the computer. This cable was provided by Boss Laser and I have not added an extension.
The files were identical. I was creating Test Tiles for engraving settings on different materials. I was simply cutting a test tile, swapping the material, then running the file again, but at some point Lightburn could not fully communicate with the controller.
Anyway, like I said, it is running great now. Thanks again!
Eric