I've been having this issue with seeing sculpt prims for the past couple weeks or so... About 50% of the time they will suddenly appear strange and claylike.
Here in an example: http://i23.photobucket.com/albums/b393/Mikana/SL%20pics/Snapshot_003-1.jpg
Has anyone else had this problem, or is it just my graphics card? The one I am currently using is a NVIDIA GeForce 6600 if it is any help. If there is a solution to this it would be greatly appreciated.