what is this?

[Anonymous]

could someone tell me what this might be please (see below). whatever it is it's cutting through both the foundation and interior walls. i can't find any object there or wall or anything. there doesn't seem to be anything to select. i've turned on all layers and i don't recall putting anything there. if i move the foundation wall back from the corner the cut disappears. i'll post the next pick in a reply.

[Anonymous]

this is what it looks like after pulling the corner connection apart.

[Anonymous]

never mind. it was a wall segment that was above the cutting plane. i looked at a section, but i had the section just a little too far north to catch the wall. i knew i would figure it out as soon as i went through the trouble of posting