I am using Windows 7 and Chrome.

I am using Windows 7 and Chrome. Notice that under 3D Viewer in the picture, there is some text instructions overlaid on the gcode controls. The gcode controls are not accessible. How to I fix this?

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This has happened to me a few times. I clear it with a browser refresh.

That means things didn’t load correctly. Definitely refresh

Refreshed several times, killed the browser and restarted, cleared the browser cache, and even rebooted the system. It won’t go away.

That means webgl is erroring out

I have had a hard time with webgl on older systems. Updating your video driver software can help. On one system I struggled with it for a few weeks and ended up upgrading the video card to make it work. I don’t remember what I was using to test the webgl and opengl but it was something like this:

https://support.esri.com/en/technical-article/000011375

Thanks Colin. I updated the graphics driver and all seems well now.