Version: Illustrator CS5.1
System: Mac OS X 10.8.5
Whenever I use a Shape tool for which the up and down arrow keys change its attributes, the up and down arrow keys skip several states. So for example, a star can go from 5 points to 12 points if I tap the up arrow key once, skipping 6 - 11 pointed stars entirely. It happens with polygons, spirals, and the flare tool as well.
I tried using a different keyboard, but the problem persisted. I also used my keyboard with another computer and Illustrator behaved just fine. So it's definitely a problem with the software.
I can't find the answer to this problem in Google searches or forums. Help!