chesky So you have no other CDM commands running in the background?
If you do click cntrl alt & Del together to pull up Task manager, and find the open cdm tab and click end task.
or what i would try is restarting your computer, That has helped for me many times.
Open back up the web page for webabd and reconnect your device with a good thick wire, anything of quality.
Allow USB debugging and click connect to pair your device, it should connect successfully.