Specifically when using Debug -> Load Hex:
During the custom program firmware test, Slow.hex loads and flashes correctly, Brick_Sending.hex flashes correctly, and Brick_Receiving.hex fails flashing (expected and a passed test). After loading the next cube to be tested however, I must completely reset Cubelet Studio and the BT before attempting to reflash Slow.hex, selecting doesn't flash or prompt the "Flashing..." status bar.