Hey all — I’ve been working through this for a few days and here’s what finally got it working:
You need to do all of these:
Update Microsoft Visual C++ Redistributable (just Google it, grab the latest from Microsoft)
Install RDWorks 8.01.68 or newer — even if you never use it, the libraries matter
Update LightBurn to 2.1 or newer
And the one that’s not obvious at all:
When you send a file to the controller, the filename can only be plain lowercase letters. Nothing else. No spaces, no numbers, no underscores, no capitals. Just letters.
testsquare works. test square, TestSquare, test_1 — all lock up the controller.
Hope this saves someone a few days of frustration.