MC6 is based on X1 (the first revision, I believe, but could be wrong). In the original revision of X1, the global snap settings on the Control Bar controlled the snap settings in the staff and piano roll views as well. unfortunately that caused problems like you're describing.
X1a release fixed the settings so that there were separate StG Staff & PRV settings which could be set apart from the global settings.
I do not believe (again, I could be wrong) that MC6 was based on X1a, but based on X1, so that means you did not get the separate StG for Staff & PRV.
Contact cake support to verify what I'm telling you, but I think you're out of luck on this unless you upgrade to Sonar X2 Essentials (X1 is no longer available, X2 is the flavor of the month).