i'm trying to wake up the guardian by collecting the heartstones and i'm on the second one but there's a problem the first time through it karn got stuck on a door frame after i knocked the heartstone down and wouldn't pick it up. so i ran back to the guardian hoping the game would fix itself but it didn't so i ran back to the heartstone and it was gone! it disappeared! so i reload the save and when i try going back to the heartstone karn won't move from the area around the guardian i stand on the pressure plate to open the doors to the 2nd stone and he just stands there and stares at me and doesn't move. if i go back around to him he'll follow me around but when i go to open the doors he stops moving. someone please help me i don't know what to do.

I saw this on IGN while using there guide, that links to the THQ Site: it looks like the best way is to delete your latest save (I don't know if this will help in any way)

http://community.darksiders.com/go/thread/view/138731/29315267/Possible_Progression_Blocker_Fix

I got passed it with no problems so it will hopefully work fine the second time around but no guarantees