I recently had a run in with the CS where it stopped letting me move/edit the objects related to my mod. All other mods worked fine and all cells not related to my mod also worked. After some hard nose detective work I solved it.
I originally posted it http://www.gamesas.com/index.php?/topic/1171439-cant-move-objects-in-render-window/page__gopid__17280172#entry17280172 but I thought I point if out for the modders who don't frequent that one. I wasn't able to find any info on it on the internet so I put it there in case anyone else has the problem in the future (or at least till the topic ages off).