do you by any chance run CloneCD with the "Hide CDR info" enabled? or maybe some other program that does the equivalent?
that could be a reason for the sysmptoms you describe.
just disable it.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien