Thank you for your answer. So you mean that you also had this problem with a Pioneer CD player not reading CD-Rs that were burned on a computer?
So gluing the lens back in solved the problem? Well of course it did!
The PD-65 reads the disc upside down, so you have to glue the lens in place.
Currently the PD2000 LTD reads any original CD-Rs. The lens is on the bottom like a regular CD player.