I still have this same issue.
I am trying to use Gingersnap on Mac OS X 10.6.8 and the root install can't find my device. I have tried rebooting several times with no luck, including removing the battery and rebooting and no luck. Screenshot attached.
I have an LG Optimus S running :
Android 2.2.2
Baseband version LS670MVD_60401001
Kernel Version 2.6.32.9
SW Version LS670ZVD
USB Debugging Enabled
USB Storage Disabled
Thanks.