Cannot paint with hp pen

I recently bought an hp spectre convertible laptop that comes with an active pen. I have been able to use the pen successfully in illustrator and fresco, but for some reason not in photoshop. I can use it to choose a tool, even use the color picker, but if i try to use any kind of selection or brush tool nothing happens. photoshop still registers where the cursor is, and it accurately follows the pen, but if i paint a stroke nothing shows up and no action is registered on the history panel. How do I fix this??