Been playing with the CK recently, and I've come across 2 hopefully small issues I haven't been able to figure out myself:

First: I created a new cell to build a house, with a door linking to it from Solitude. This initially worked fine (tested ingame), but after some time working on the new cell - but not changing either door - my game now has a CTD when I activate the door in Solitude. Any idea why? I'm assuming I've done something to break them but I can't tell what. It will also CTD if I try and use the console to teleport (coc) into the cell. I tried deleting and recreating the doors in the new and existing cell but it has the same issue.

Second: In the new cell I added a few bookshelves using the tutorial from the CK website. The shelves almost worked, but for some reason when you place books on them, the books don't 'settle' like a vanilla shelf, but tend to freak out and end up mashed together randomly on the shelf. I've no idea why this is; I compared to vanilla shelves and don't think I did anything differently.