MR816csx audio dropouts

i have the same prob since i installed Cubase 6 and the new driver for my MR816 CSX…!!
With the driver 1.7 i had every sec dropouts then i changed to 1.6 and now i have less dropouts but they still there…
I’m really mad with steinberg i hope work hard an any solution for this massive problem!!!
Cubase 5.5 on my Old G5 Quad was perfect and now i have a Mac pro and Cubase 6 and i can’t produce because dropouts and crashing Cubase…!!