Originally posted by gster123 It might be that you have to up the number of subdivisions for the object. I think it works by calculating the colides between the verts and the lines between them to make a colision plane, if I remember reading a post by Duncan Brinsmede (think thats his name, one of the principle scientists at autodesk) try smoothin your cube so it has more subdivisions and give that a go. he is 100% right there, there is no were near the number of polys on that cube needed for a simulation. Also make sure the cache has been delete as It could be using some old cache files. Check the time frame on the nucle as well as you may have keyed a value there as well but over all I think its the poly number. You are using the service pack ain`t you ??? as 8.5 had afew bugs with ncloth