Hi Guys
I have a peculiar problem.
My Trim curve brushes, dont trim - they instead polygroup like the slice curve does.
I have no idea what i clicked on, is there anyway to fix this?
Any help appreciated. 
if you have a mask on the object when using trim it will slice - that may be your issue?
You have to start and end your trim curve with holding both CONTROL + SHIFT.
When you hold CONTROL+SHIFT to start the trim curve and then you only hold CONTROL and tap ALT to make the curve anchor point, you have to re-press CONTROL + SHIFT at the end before you let go. If your only holding control it becomes a slice curve.
I really have no idea why they made it that way. Maybe the pixologic people have just overlooked it.