Can burn DVD but not CD Ubuntu

Recently I asked a question as I could not burn with my dvd drive :

https://answers.launchpad.net/ubuntu/+question/81607

I thought this was fixed until today when I discovered that although I can burn all sorts of DVD I cannot burn CDs (date, audio or ISO images). Any ideas?

I'm using Gnome Baker, but the problem happens in other applications also.

Below is a log of the kind of thing that happens (if it is any help):

wodim: No write mode specified.
wodim: Asuming -tao mode.
wodim: Future versions of wodim may have different drive dependent defaults.
wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.9
SCSI buffer size: 64512
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
TOC Type: 3 = CD-ROM XA mode 2
Device type : Removable CD-ROM
Version : 5
Response Format: 2
Capabilities :
Vendor_info : 'PLEXTOR '
Identification : 'DVDR PX-716A '
Revision : '1.11'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x0009 (CD-R)
Profile: 0x002B (DVD+R/DL)
Profile: 0x001B (DVD+R)
Profile: 0x001A (DVD+RW)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0011 (DVD-R sequential recording)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW)
Profile: 0x0009 (CD-R) (current)
Profile: 0x0008 (CD-ROM)
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 4802784 = 4690 KB
Drive DMA Speed: 8135 kB/s 46x CD 5x DVD
FIFO size : 12582912 = 12288 KB
Speed set to 8467 KB/s
wodim: DMA speed too slow (OK for 37x). Cannot write at speed 48x.
 4 seconds. 3 seconds. 2 seconds. 1 seconds. 0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Errno: 5 (Input/output error), send opc scsi sendcmd: no error
CDB: 54 01 00 00 00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 00 00 00 0A 00 00 00 00 02 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x02 Qual 0x00 (no seek complete) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 29.048s timeout 60s
wodim: OPC failed.
Writing time: 33.859s
wodim: fifo had 96 puts and 0 gets.
wodim: fifo was 0 times empty and 0 times full, min fill was 100%.