OK, this is a weird one. I've been making a cell for ilDuch, and for some reason, now that I'm almost done, using COC to go there adds a door to the cell, halfway embedded in the floor, wherever I COC in. I've never seen this happen before, and I'm pretty sure it's not supposed to do that. There's no door there in the editor, so I'm pretty sure it's somehow being added dynamically when I COC in.

You could select the door in the console to see if it's being dynamically added by checking the form id... But yeah, really strange. No idea, sorry.

Hah...partly figured it out...there was a door way out in the void...guess if an object is outside the normal cell boundaries it's teleported to the player when he enters the cell?