Is there a way to fix this box select glitch (Make 2017 on 4k iMac)?

No. Blender (3D graphics), Autodesk SketchBook (2D graphics), UPBGE, MakeHuman, Gephi, and Godot all seem to work fine. As far as I’m aware, SketchUp is the only application I have with graphics issues.

Yes, I have a stock built-in iMac display. I’m not using a separate monitor.

Well, I’m not sure if this is what you mean, but I just updated to the latest OS & that didn’t solve the problem, unfortunately.

I don’t know if my problem is being caused by hardware failure because I’ve seen many other people have similar problems.

https://www.reddit.com/r/Sketchup/comments/8wi4ih/hi_i_installed_sketchup_2017_and_vray_34my/