To follow up from the previous posting: I moved GR which was
previously-compiled for Intel-Mac (on a MacBook Pro from mid-summer)
to the new 20" iMac, and it worked great with the most recent
DarwinPorts applications and libraries installed (LIBUSB version is
the same). So I feel even more confident that it’s not LIBUSB
directly which is the issue, but rather some change to the USRP’s
software made since mid-summer. More as I investigate it. - MLD