Wacom dual display setup

Hi,

I'm using a Wacom Intuos 3 on the mac pro with two Dell 2407 monitors. On top of the tablet is my keyboard. I use the lower part for the pen. But after the Maverick update when I want to set up the tablet the second display is lower than the first one. As you can see in the screen shot. Is this a Wacom or Mavericks thing? TIA