Same problems has before, after making any changes to leveledlist, saving, then trying to open with tessnip causes a crashcould be leveled actors subrecord modl that is getting added that could be causing tessnip to crash.
fnvedit show this for order of subrecords EDID LVLD LVLF MODL LLCT LVLO LVLO LVLO LVLO < - the modl should be at very end..
But in fnvedit the list are on longer empty and kept the changes that I did make in skyedit.
Let me try and make just leveled actor changes and not having any new npc records, armo / arma records and see if one of those may not be the cause..and will report back..
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Can we have a backup feature like what tes4edit/fnvedit have, that when you activate a esp from selection list, it makes a backup copy once it is modified in skyedit folder just in case something happens..or in skyrim folder and name plugin example: skyrimcreaturesalive.esp.sky001
if that is possible..
Except for a few certain subrecords SkyEdit doesn't set their particular location within the record. This worked for Morrowind and Oblivion and assume for Skyrim as well. I wouldn't think tessnip would care about the subrecord order unless the data itself is corrupt. If Skyrim needs the MODL at the end I can force the its position.
SkyEdit already backs up plugins when saving unless you've disabled it or there is a bug preventing it. Look in your "Skyrim\Data\Backup" folder.

Makes it easy to put out two versions.
Figured it'd be a pretty easy add compared to others, but I'm not too worried about it.