Any Ideas?

I have heard about/experienced M4-78 being a buggy ass mod in the past (and once i finally got it working i didn't like it at all, not like the rest of the game in a bad way, i thought it was better off cut from the game) due to its size. Wouldn't surprise me if for some reason it was the one causing it.

Although there is also a slight chance that Hide Weapons in Animations might cause it, since it fiddles with animations and cutscenes trigger animations! Sounds like a weird logic to follow but once you've been modding this game for a decade you'll understand its never been very mod friendly like, say, an elder scrolls game.

In conclusion: I suggest you try removing the Hide Weapons first and just load a save from before you entered the tomb (this is easier to test). If it still crashes your game then all thats left is M4-78.

M4-78 is trickier to test. You would have to load a save from BEFORE you first enter Korriban (to avoid any save corruption, since you would be loading triggers and data that dont exist anymore).