To open jammed items you have 2 choices... 1.) Break it open. By holding the alt key you can open attack objects (doors, chests, and lights). If you break open an NPC's items chest their selection for buying will no longer change and will stay the same. 2.) Wait a day and it'll be unjammed.
arrg well, ive figured out how to target jammed items and attack them. The problem now is getting Virgil to stop attacking something that for whatever reason just wont open. He just sits there attacking and damaging his weapon. :sad:
Back off Tell virgil to back off. (Either hit f5 or right click on his portrait) to tell him to not beat on something anymore. This includes chests and etc.