For those of us who can't play burned CR-R on their stock HU, here is what I found after several months of trial and error procedures. The HU works perfectly with SONY CD-R (700MB/80min, 1x-32x compatible). The 10 pack box is yellow and blue and the recordable face of the CD-R is blue. I burned the CDs with the MusicMatch Jukebox burner at 1x speed.
Until now I burned a dozen CDs and play them several times on the stock HU. No errors, no skips, even on bumps. Work great.
I'll use the CD creator burner to see if the SONY CD-R work as well and will report soon.