GSA-1466B and Lightscribe

I recently installed by GSA-14666B with LightScribe. The Lightscribe worked for a few days,but now all of a sudden the Lightscribe programs (Nero, Sure Thing) all display the error message “LightScribe Engine Error Message” There are no LightScribe devices found on this computer. I have upgraded the firmware, reinstalled the lightscribe programs, etc, and nothing works. Any ideas?