This is to fix the infamous Carth Bug that is caused on the Leviathan from having your character cloaked.  It was posted on the Bioware forums, but the thread had to be closed because of the nature of the thread.

Here is what you do:
If you used Mission to free everyone, use the files in the "for Mission" folder.
If you used Juhani to free everyone, use the files in the "for Juhani" folder.
Open the folder for the save game you need to fix (It is best to save your game AFTER the battle with Darth Malak, right before you go through the doors at the end of the level), and you will see another folder named 0001 - Slot 1, or whatever slot it is.  Open this folder, backup your PARTYTABLE.res and SAVE_PARTY.sig files that are in here.  Hell, backup the whole save folder.  Then place the files PARTYTABLE.res and SAVE_PARTY.sig files from here into your save folder.  Load it onto your XBOX, load the save game, now Mission or Juhani is in your party and you can turn cloaking off.  Beat the level, save, then replace PARTYTABLE.res and SAVE_PARTY.sig with your backup files.  All done.

Juhani has not been tested, but I think her fix should work without any problems.

-dmauro