Why can't I draw using my pen tablet in Flash?

I can draw with my pen tablet in Photoshop, but not Flash! I have a Yiynova tablet monitor that works excellent for drawing in Photoshop, but when I try to draw in Flash I get this odd straight line that goes straight off my canvas. Is this because Flash can't recognize my pen? I can still use the shape tool, and other parts the program by clicking around. But the second I try to draw, I only get this weird line --->