Photoshop CS4 Does Not Recognize my v700

[vinny]

Your OS is likely 32 bit already. Which is it?

10.7.2

[Daniel Moore]

Next thing to try, a temporary setting:

"If your Mac uses the 64-bit kernel by default, you can start up with the 32-bit kernel by holding the 3 and 2 keys during startup."

"Your Mac will revert to the default kernel the next time you reboot it."

This will rule out one variable. Try the twain import in CS4 once you've booted in 32 bit mode.