chance that a different driver for this GeForce 2 based GPU (yes, GF4 MX is a GF2 no GF4 chip so really old) fixes the problem is larger. (NV is changing their DX7 driver implementation on some major part every few versions for some stupid reason. Thats why power of 2, square is needed with GF 6600 again in dx7 or it will break)