I wish it was just a problem with the cell, but it happens in any cell I use, vanilla or otherwise (and I've used quite a few of both).
I have no problems making those types of lights. I can make 'em and place 'em all day long with no problems at all.
Thanks for the .nif! JDfan over at the BGS forums made a similar one for me. Oddly enough, I can get both into the CS as light objects and save the .esp without a crash, but the CS still crashes when I try to add either one directly to a cell. However, If I add a vanilla light to a cell and then use Search & Replace to add yours and/or JDFan's, it works. Once I get just one of them placed in that manner, I can drag more into the render window without any problems. A nice little workaround.
Not sure why I'm have trouble saving with some and not others, but oh well. So, it's a bounding radius issue, eh? Interesting. Have you tried the "Search & Replace" technique instead of/in addition to using TES4Edit?
Out of curiosity, would plugins created with the CSE require OBSE in order to work if no OBSE functions are used?
Thanks, DsoS!
And thanks to all of you for helping me with this!