There is a topic that discusses this problem.
I posted this sometime towards the end of the last year when Live first came out.
The Dual Action is defective. Aside from P Dub's comments, a lot of the users on the Logitech User Discussion Forums state the same problems.
It worked for me like the first day and the next day Vince Carter could only dunk from his right.
Also, if you're looking for a failsafe controller, spend the extra bucks on a Super Dual Box from MayFlash found on
www.merconnet.com. It's a USB converter that'll convert your PSone/PS2/PSX controllers into PC controllers.
If you've got WinXP no need to install drivers. It's great. It's a bit costly... but it'll save years and years of hassle.