Gsender doesnt show up on preview anymore

I have been using Gsender for over a yr, yesterday when i started it and connected to machine my preview screen is white. I can connect, i can jog. If I load a file the preview window stays white. Any ideas. I tried different versions no luck.

Update, still dont know what it was, but its fixed. After installing different version, i clicked a restore factory defaults button a nd it all came on

Did you upgrade versions or was the same version that was working stopped working suddenly? Which version are you running? What operating system/architecture?

Do you have light mode enabled with visualizer off?