I don't know what causes this bug, but the problem seems to be mostly with chests that weigh nothing when open. It is apparently a graphical issue, though, since it is still possible to see and access the chests under some circumstances.
Thanks for the confirmation, Raze. I will make sure that I stay away from using chests that way nothing when open. <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />
