<My Documents>\Electronic Arts\The Sims 3\scriptcache.package (for base game, it may be in different location for the EPs.

Got the same problem here...KS missing from the skills panel.

@Wolffe : tried that...did'nt work for me. I loaded an earlier save, and it was there. Loaded another (that I know was working) and it was'nt there. My scriptcache.package is 168 bytes. Tried deleting all cache files...no go, either.

@Twallan : is it possible to move my sims from the earlier save to the clipboard and move them into the later save house...would like to make sure I havent overwritten by mistake.
If their skills dont show in later save, then so be it.

@UKDave interesting. i do know that if you've loaded a game where it did not show, and save that, it is lost and has to totally be built back up. if you play the old save that still has it, play forward with that it should not disappear again if you remember to clear the scriptcache every time. are you using just the base game? something may be different that i am not aware of on the EPs.

The skill does export with your sim when you save them to the library.

That might indicate you have a broken mod with a name starting with a letter before N but after A.

My experience is that it orders mods alphabetically when loading them in, and when it finds a broken one, all other mods after that alphabetically aren't loaded. (I could be wrong, but this is how it seems from my experience!)

Thanks Bones2056! I was afraid mine might never return!