Used to burn/read DVD-R and +R disks, lately will only burn +R.

My MBP used to burn/read DVD-R and +R disks.  Lately will only burn +R. 
The drive info:
HL-DT-ST DVDRW  GS23N:
  Firmware Revision:          SB03
  Interconnect:          ATAPI
  Burn Support:          Yes (Apple Shipping Drive)
  Cache:          0 KB
  Reads DVD:          Yes
  CD-Write:          -R, -RW
  DVD-Write:          -R, -RW
  Write Strategies:          CD-TAO, CD-SAO, CD-Raw, DVD-DAO
  Media:          To show the available burn speeds, insert a disc and choose View > Refresh
Others show the drive with -/+R -/+RW and DL (and more) and 2 MB buffer...
It makes no sense to me, need help.  Thanks.
Leslie.

Hi Leslie,
Try an SMC Reset: http://support.apple.com/kb/HT3964                              

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