Triangle Appears in my Section Cut (SU Pro)

[mandpbetts]

Any idea why I'm getting this triangle in my section cut? There's nothing there that I can see, and it appears regardless of where it's placed in the room. It doesn't matter what I use to create the section (tried a couple of walls, and the shower screen).

[Box]

That would appear to be telling you that your wall isn’t flat, or you created the section at an angle.

[mandpbetts]

That was my first thought, but I’ve recreated the section on different surfaces, including new ones I’ve added to guarantee they’re square.
I can do a section facing the other direction with no trouble, then reverse it, and the triangle reappears.

[Box]

Can you attach a model that shows this.

[mandpbetts]

(Model removed)
Section 4 is the problem, I’ve tried reversing Section 5.

[mihai.s]

If you make a separation between the construction elements, walls, floors, grouping each one separately, you solve the problem in the section.

[mandpbetts]

Thank you so much! It worked!

[Box]

You also need to sort out your face orientation. All the blue faces are the back faces and shouldn’t be visible when viewed in Monochrome mode.

[mandpbetts]

Good point - thanks.