For some reason, my Fortress static meshes keep going invisible. When I place them, they are there. I go a few cells away to the harbor I've built and come back and boom they are freakin' invisible. Here's a screenshot. As you can see the only visible thing is the [censored] ladder. Any idea what's causing this? It's making my efforts useless.

http://i.imgur.com/SAzqm.jpg

I had the same problem http://www.gamesas.com/topic/1355745-big-items-dissapearing-in-the-creation-kit/ - the solution that I was given seemed to sort the issue, it appears to generate a wider amount of cells to render everything in and doesn't react to you moving out of them - handy if you want to check out your work from a long distance - although if you go to work in a different bunch of cells to the ones around you, then items dissapear again and you need to hit F5 so it regenerates the cell view in your vicinity. There's also some threads kicking about on landscape and object LOD if you're having issues seeing things far away in-game.

Thanks, I'll try that out!