Sorry for not getting back sonner, Real Life comes first..
When you say "crash" do you mean SkyEdit, Skyrim or something else? I cannot duplicate the changes not being saved in Leveled Actors although I do see, and fixed, a potential issue with the ordering of subrecords which the game might not like and may cause it to crash. If the leveled list is somehow corrupted in the plugin it may not load correctly in SkyEdit and result in not being able to update changes. Feel free to email me the mod if you'd like it fixed or even just for me to see what the reason is.
crash is in tessnip not skyedit ..Try just resaving the leveledlist from this, make a backup copy first.
http://www.skyrimnexus.com/downloads/file.php?id=69
I think this is happening .
skyedit is correcting the invalid LLCT that exists because I have not fixed them yet..and when viewed in fnvedit the list appear empty, but, are not really because llct is getting corrected and model stuff is getting added which should not be unless 1) master record has it or 2) manually adding them
also if I just go through all the lcharambient*.* list and make active in new plugin , and then tick "calculate from all levels" and "count" on them all and save, same results has above..
Hopefully that helps..
I also sent PlutoMan the same thing from above to test..but he has a slighty new version, but, problems exist's in both..
Else it could be I do have alot of security protetion running has well - mse, secureanywhere, outpost pro..all with behavior blocking enabled etc..wonder skyedit needs access to something that I am not giving it..