GrahhhH

Try going where you imagine you canyon is flying on the map, and see if there is anything of you map visible, if cant see anything (just in case,then you could hide it our move to somewhere else), i guess you dont have to worry about. :D

It is a object or a terrain part? maybe if you look into the base, double click and edit base, there are some settings like "never fade" or "has distant lod", don't know if helps, but you can give a try. :D

if i have understand right, a part of the mountain disapear when you are walking around? Have you tried to change the view distance of your game settings?

The title almost says all. I've duplicated a cell, and erased everything, started from scratch, and added a few npc's (that i dont have duplicated), then, after editing another cells i came back to the first one, and decide to make all diferent, erased everything again. Then the problem shows up, i've put 5 NPC's on the cell (Safia, Dorian, Xander, Eris and Sabine Nytte), and deleted all things in the cell, including the navmesh. When building again the dungeon i've tested several times ingame, and everything just went fine, untill i've made a new navmesh, and the "deleted" npc's (that dont show up on the CK) appeared in the game (they dont appear on the cell view list of the cell). there is any way to erase them of the cell? or i should begin the dungeon in another cell? using cut and paste, and remaking the navmesh. thanks in advance!!! Sorry if there is english errors (not my native language) and if this is not the place to this kind of help.