Hi Shawn,
Are you certain the ASCOM POTH is correctly configured for the LX200 protocol? Using Maxim, can you successfully connect and control the telescope through the POTH?
If so, then the problem is with CDC, if not you may need to reinstall ASCOM. Make sure you've also pulled down the latest LX200 driver as well.
http://www.ascom-standards.org/downloads.html