Digital BW, The Print

I tried edge sharpening using a channel mask with nice results on a 
portrait.  However, when I converted to RGB and tried to apply the 
Roark curves (MIS VM on a 1200) I got very strange results.  It 
appears that the colors only "took" on the portions that had been 
sharpened, that were black on the mask.  It printed strangely.  When 
I applied the curves to a copy that had not been sharpened, it looked 
normal.  Any ideas about what I missed?

Steve