System hang when using "section"

Any buddy can give me advice to solve the problem when I use section, my computer hangs and no response. But for another function is ok and working smoothly.

You could try repairing the install, find the installer of sketchup right click on it and run as administrator, then choose repair.
How big is your file? Can you share it so we can check what’s going on?

3D model 2.skp (2.9 MB)

Thank you Francis.

When you try to add a section cut do you see the message window asking you to name the section?