Student can't see running code

[Chrisir]

Can YOU see the program running?

@MrRuTech

We have tried this on several devices and browsers but it still doesn’t show the program running

So, it is one Sketch that is causing this and other Sketch can be seen running normally on the same device / browser?

I mean when you think it is caused by the Sketch, you have to post the Sketch here.

Or the link