This looks like a graphics issue. What model of nVidia graphics card do you have? Can you share the file so we can compare on a different machine?
Idk, I’m going to find out
So it’s an Intel ingrated graphics adapter not an nVidia graphics card. Please correct your forum profile.
Share the .skp file so we can see exactly what you have set up and help you get it sorted out.
Last version ApNY.skp (9.0 MB)
It’s a graphics issue related to distant group origins and geometry at a large distance from the rest of the model. Your model was strangely made wih geometry located at a huge distance from the group origins.
I fixed the groups with the distant axes. I also discovered a couple of components located at a great distance from the rest of the model which I deleted. I moved the grid close to the rest of the model, too. Then I copied everything and pasted it into a new model. It looks like this now.
I also fixed incorrect tag usage in your model. ALL edges and faces should be created and remain untagged.
Last version ApNY fixed.skp (6.9 MB)
You are an Angel! I didn’t know why components were disappearing. Looking for a solution before, I notice the axis distance and tried to fix. I’ll reread all the problems you listed to try not to have this problem again. Thank you so so much!