I think that I found the problem. You need to change the size point below where the inspector is located such as (on Properties window) Size, Edge, Shape, Range, and Exposure. I believe that yours was Size 1 because you can't see the tiny spot. Smile. You might want to mark boxes for all checks except 9-Scale option on Edit in the Fireworks preferences.
iMac OS 10.7.3, iMac i7, Fireworks CS 5.1 (184.108.40.206)