Teacher here. I have a student with a Mac.
When she tries to complete the Lessons in 3D (Learn -> Lessons ) like Learning the Moves, Camera Controls, Making Holes, the Tinkercad workspace opens up, but it's missing stuff.
For example, in "Learning the Moves", she sees the orange outline, but not the building interior or the building. It's impossible to do the lessons because of missing parts.
I've confirmed she has WebGL. She has tried it on multiple browsers to no avail.
Both she and I opened support tickets (mine is 219668, submitted almost 2 weeks ago) but haven't heard anything.
Thanks for any help. I have never seen this before.