just experienced the issue !! and i'm on Windows 7 !!
everything working great on sonar 8.5 .....but master fader is messy on X1D
here's the story :
I bought and installed X3 ... did a restort of the system to come back to X1D (not the subject here) ....
My restore point was done at X1D time while i just unistalled x2 and for some reason , i had no more the VS 700 plugin on shared surface ...
I called the support and the sent me an installer ...and now i'm here !! on windows 7 and no more master fader working while it's working on 8.5 witch share the same folder Shared surface !!!
Thks
EDIT : performed factory reset , delated the TSSEQ and surface stuff ...did a calibration and all test on the VS 700 C , re performed a X1D update (to force re writte the vs 700 C dll in shared surfaces) ..nothing ...