Signature is grayed out in Mountain Lion's Preview app menu
Does this feature only work with certain hardware? I'm using a 2008 2.2 GHz Intel Core 2 Duo MBP with OS 10.8. I needed to get a signed letter out quickly and tried to use Preview's Tools > Annotate > Signature capability. I also tried the Marker drop-down in the tool bar. The Annotate menu had a grayed Signature and the drop-down didn't list iSight, so I couldn't capture an image of my signature. The iSight works fine for PhotoBooth, so I assume that can't be the problem.
Any help would be appreciated:-)
BTW, PDF Pen for the Mac and the iPad came to the rescue... great apps!
MacBook Pro, OS X Mountain Lion, 2008 2.2 GHz Intel Core 2 Duo