Roatation / pen direction (?)

I'm not sure how to ask this but I'll try...
In the image on the HUD where it shows what the bristles will look like, there is a white line. It used to be that when I would go to brush "5", that line seemed to move with my stylus direction (although it also seemed rather random). At one point, in one of my paintings, I must have hit something because ALL of the brushes started acting that way. Now, none of them are (including brush 5). And at one point, while changing my bias, I seemed to change the direction/rotation white-line-thing, but it still stayed static.
Is all that normal? How can I set it to work with my stylus direction? How do I set the direction to something else? (I don't see anything about it in the info post... unless I missed it)
In the image on the HUD where it shows what the bristles will look like, there is a white line. It used to be that when I would go to brush "5", that line seemed to move with my stylus direction (although it also seemed rather random). At one point, in one of my paintings, I must have hit something because ALL of the brushes started acting that way. Now, none of them are (including brush 5). And at one point, while changing my bias, I seemed to change the direction/rotation white-line-thing, but it still stayed static.
Is all that normal? How can I set it to work with my stylus direction? How do I set the direction to something else? (I don't see anything about it in the info post... unless I missed it)