Quote Originally Posted by jahrain View Post
Try selecting and moving all the vertexes to the object's pivot point, then placing the model back to the original spot by moving the object, not the vertexes. Also, make sure the instances aren't too large or span across portals. If all else fails, just weld it to the main BSP.
I tried this and it didn't work. I wish I new the logic behind moving the pivot. I do have a lot of instanced geometry. And only geometry I made in the end has this problem. Earlier made instanced geometry dose not disappear, every thing I made at one point has this problem. With or without portals it is the same.