problem with SEO?

[Palawat]

Hi, everyone. Seems like a did something wrong and I didn't even know what I did.

I opened a project, everything seems fine on 2D but when I switched to 3D window I noticed that there are some kind of red transparent box under every objects with SEO (picture on the left). And with the marquee selection, that's what happen (picture on the right).



I might have accidentally turn on/off some kinda feature I don't know about. I'm pretty new with AC15. Any suggestion would be appreciate.

[Palawat]

It's all good now

While in 3D window, I clicked Design/Connect/Trimming Bodies and the black mass in the marqueed 3D window disappear!

[Barry Kelly]

The black surface is just because your marquee cutting plane is passing through the trimming bodies.
You can either turn the trimming bodies off or change the setting for your cut surfaces (see attached image).
This affects the cut in the trimming body as well (which personally I think should alway be transparent regardless of the setting).
Barry.

[Palawat]

Thank you very much for the clarification, Barry.