There's something very wrong with your game. First, the Machete is missing, now you don't have Urgon's Part - how did you finish the Shambala level without it?
Anyway, the best would be to re-play the current level from the beginning based on a savegame which is OK.
1) Download the update 1.2 from lucasarts:
Just start it with a double-click, it installs itself
2) Go to my start savegame download page at
Pick the start file of your current level and put it into your SaveGames folder.
This should work. Good luck!