Hmmm... I am wondering if it is the chemical formulation or if it is capacity. Most CDR media today is 80 minute, stretching the true standard for the "color book" formats. You might want to see if 74 minute media, even the light green and silver, will work in the player. Also, a lot of the newer media is formulated for high speed writing and will not work well below 4x or even 16x.

If not, my personal preference for media is CDR Outlet. I looked, though, and did not see the older formulations. Of course you realize what the CDR FAQ says about identifying media by color...