[jjmoon]

This took me a full day to setup and figure out, I have the exact same setup as you....

And I was having the exact same problem as you with hanging on Xpand during launch......

Here is what worked for me,make sure you have no other devices on the other usb port when launching PT,

I have to remove my powered usb hub so the external usb drives and even keyboard are not connected to my Macbook Pro when launching PT 8.03cs and this gets around the problem...

Btw, you need to use the usb port FURTHEST away from the Firewire 800 port or else it will not launch

Also when importing video into a session, you need to make sure no devices are on the second USB port or it will also hang.