Two of us have experienced bug problems when it comes to traps. The one I had was an enemy was standing on top of a trap...I killed him, looked for the trap again...it was gone. I could walk right thru the area. However, I could not pick up the 'booty' from the kill.
My friend doesn't have a thief, and just goes thru traps, hoping they don't kill his guys. He opened a trapped chest, set off the trap, but couldn't move any more (not due to spells). He could sometimes re-open the chest (since he was so close), but couldn't move. He saved & reloaded, and this fixed the problem. This has happened to him a couple of times....not sure if the second time also involved trying to get items.

Anyone else? Anyone know if Icewind Dale people read this site & could fix this bug in their next patch?

yea my game has done that a couple times. but i just scrolled the screen far enough so that the area in question was out of the way and then went back and I was able to pick up the items/set off the trap.
about a patch...I can't help...