Brushes question

[hongkongluna]

Hello All,
Beginner question on brushes. Some of my art brushes will knockout the stroke color when the stroke overlaps itself. Others do not. Can't figure out how to stop that knockout bit. Any suggestions? Comparing two of the brushes, it's not obvious what settings are different. THANKS.

R

[iDad]

knockout? I think you need to rasterize the stoke first before adding another element to layer

[hongkongluna]

I mean a letterform that overlaps itself. LIke the two tops of an M for example. The overlapping area of the two tops turns white. Does that make sense? Tried to attach image but "the board attachment quota has been reached"
http://www.flickr.com/photos/47598683@N06/4780332687/

[iDad]

can you post a screen shot of the psd before or just after placing stroke?
That's very peculiar