Domain computers cannot read or write blank or written writable discs

                              DVD RW drives (SATA built in and USB external) across all machines in our domain will not read or write writable discs. Reading of "manufacturer" discs works fine.

This has been tested with various brands of writable / rewritable disc, both blank and non-blank.

I've tested two external USB DVD drives with the same media on a machine outside of the domain and reading and writing writable discs works fine. So I reckon I've eliminated the hardware and disc media as causes.

On the domain machines there are no values set for the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
      LowerFilters
      UpperFilters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet001\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
      LowerFilters
      UpperFilters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet002\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
      LowerFilters
      UpperFilters

Domain machines are running Windows 7 x64 Professional and are fully patched.

Although I am aware that the domain machines previously had a policy deployed to disable writing to all removable media and disabling writing to CD / DVD drives this policy is no longer present and On the domain machines a check of resultant set of policy does not have any settings disabling CD/DVD or other removable media read / write set.

I have subsequently tried adding the following registry keys

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\
Explorer] and [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\
Explorer]
Value Name: NoCDBurning
Data Type: REG_DWORD (DWORD Value)
Value Data: 0 = Allow CDR

But this did not help

Can anyone advise?