tablet + pen pressure + illustrator CS5 issue

Hello all,

   I just installed Illustrator CS5 and I can't get the brushes to recognize pen pressure from my graphics tablet (intuos3).

I have tried all the combos of brushes, strokes, etc.  It looks like all the 6D options (bearing, tilt, pressure) are greyed out. Thus, the ap doesn't recognize when I am using my pen.

Oddly, the pen works great in Photoshop CS5.

I am working on Windows 7.

Any thoughts?

Thanks!

_Todd