I got something very similar to this - before my eyes - last night with the 99c special 'Spell Bound' from PoserPros! The reason I mention it here as (just maybe) relevant is that I also was playing around with hiding body parts when it occurred. The right collar of the bodice 'suddenly' became completely deformed. I've no idea why it happened, but all I was doing at the time was hidingshowing body parts for the same poke through reasons. I was doing this manually, and I can't remember whether or not I actually used the hide/show poses that are included with the spell bound package before this happened. Even a restore of everything left me with a deformed right collar in the clothing item. I've just tried to see if I could reproduce the problem, but as of yet I can't and it remains a mystery to me too. One last immensely speculative muse - I wonder if this gravity thing must sometimes be seen to be done?