Couple issues I need help with

[Dr. Walrus]

I've got two bugs I cannot figure out how to resolve for the life of me.

1) There's a random, tall block that appears when I run map or create a server with the map, that is NOT in the editor and I cannot figure out where it is coming from or how to get rid of it. (Posted below are screenshots of

a) top down view / side view/ 3d viewer where it would be in editor highlighted with yellow square (its not there)
b) running the map (suddenly its there)

2) I'm having dynamic lighting issues, I think. A lot of the entities (ie trees, arches, boxes, background buildings, etc.) randomly flicker and flash both when walking towards/away from them as well as sometimes holding still. Any advice?

Screenshots of issue #1:

 

[Cloakedsphere]

There seems to be a model literally right there where the part is sticking way up. I cannot tell from the wire mesh but it does look like there might be something there.

 

[Dr. Walrus]

I'm 100% certain that the model is not there in wireframes... the side/front view are the best indication that its not there since it goes way up nearly to the skybox.