Photoshop :: Pen Sensitivity Not Available Without Pressure-sensitive Tablet

I'm using Photoshop CS6 64-bit with a Wacom Bamboo Pen tablet.  I've already tried fixing/resetting the tablet numerous times, and I've come to the conclusion that the problem is with Photoshop, not the tablet.  Important points of my problem
 
1. Whenever I completely reset my computer, photoshop recognizes the tablet and uses it correctly. The problem arises after I close my laptop or unplug the tablet.  When I try to use it again, it gives the triangle warning box that says pen sensitivity is not available without a pressure-sensitive tablet.
2. The tablet with Pen Pressure works in Manga Studio 100% of the time.  This is why I'm posting this in the Adobe Forums, not Wacom.
 
I've tried several fixes, I must have reinstalled different versions of my Tablet Driver 10 times at least, it always comes back to this same problem.  No matter what I do, it works for awhile, but when I put my laptop to sleep or unplug the tablet, photoshop no longer recognizes it.