We have recently upgraded all the netbackup clients in our production environment to 7.5.0.4

Since the upgrade SQL backups have been failing with error code 2.  The error as per the job details are pasted below

24/02/2013 1:30:21 PM - Error bpbrm(pid=10184) from client OPDSQLC23: ERR - command failed: unimplemented error code 255 (255)
24/02/2013 1:30:21 PM - Error bpbrm(pid=10184) from client OPDSQLC23: ERR - bphdb exit status = 2: none of the requested files were backed up
24/02/2013 1:30:23 PM - end writing

On the SQL client the windows application logs indicates an error

Faulting application name: dbbackex.exe, version: 7.500.412.916, time stamp: 0x5055e257

Faulting module name: xbsa.dll, version: 7.500.412.916, time stamp: 0x5055dcde

Exception code: 0xc0000005

Fault offset: 0x000000000000d576

Faulting process id: 0x8d4

Faulting application start time: 0x01ce12363db45b8a

Faulting application path: C:\Program Files\Veritas\NetBackup\bin\dbbackex.exe

Faulting module path: C:\Program Files\Veritas\NetBackup\bin\xbsa.dll

Report Id: 8314bf23-7e29-11e2-a9d2-00215a9b1b16

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

I logged a call with tech support and was told to roll back the upgrades for the time being.

Has anyone come across this error before ? Any assistance would be appreciated.