Okay, the PC is an old one and it started failing to boot properly after the install of VZ Access. Nothing to do with VZ, just old PC. Put in a new motherboard battery, reset the BIOS, wiped the disk, ran disk and memory tests, reloaded OS from backup image. Seems to be in good shape now.
Installed VZ on the refreshed PC and it detected the U760 and offered to upgrade the firmware. I let it. I was able to connect with either VZ Access or MobiLink, although I seem to have to power off the machine for a minute after using MobiLink or VZ won't detect the modem.
Now I can finally get to the point where I can find the instructions to get to the diagnostic mode of VZ Access to get the raw signal strength numbers. Sheeesh! -- Millenicom:Verizon:3G