So I'm working on a mod of mine and I've been having a weird visual glitch -- I've made an underground Vault and occasionally the entrance, which is the CaveExit01 piece, just doesn't show up in-game. It displays fine in the GECK, and I know the game is showing it as there, because my character can still walk on it and if I run at where the walls should be, I don't go through, but it just sometimes doesn't display. Not always, only sometimes. I've attached a screenshot I took of the glitch; you can also see the glitch in this video review that ArcadableProductions did of my mod (around 6:14): https://youtu.be/-ieRpfOzgfg?t=6m14s I've been driving myself crazy trying to do something to fix it, and I'm just completely stumped as to what could be causing it. Any ideas?