Automatic print routing aborting job

[David McNicoll]

Our ERP software uses and automatic print routing for printing packing slips to our line printers.

We have recently upgraded from RHEL 3 to 6.3.  Since the upgrade the auto print feature is dropping print jobs, yet the ERP software registers them as printed.

All manual printing functions seem to be working fine.

Here is the error_log of the job that failed.

I [14/Aug/2012:12:11:38 -0400] [Job 8604] Adding end banner page "none".
D [14/Aug/2012:12:11:38 -0400] Discarding unused job-state-changed event...
I [14/Aug/2012:12:11:38 -0400] [Job 8604] Job submission timed out.
D [14/Aug/2012:12:11:38 -0400] cupsdMarkDirty(----J-)
D [14/Aug/2012:12:11:38 -0400] cupsdSetBusyState: Dirty files
D [14/Aug/2012:12:11:38 -0400] Discarding unused job-completed event...
E [14/Aug/2012:12:11:38 -0400] [Job 8604] Aborting job because it has no files.
D [14/Aug/2012:12:11:38 -0400] [Job 8604] Unloading...
D [14/Aug/2012:12:11:38 -0400] cupsdAcceptClient: skipping getpeercon()
D [14/Aug/2012:12:11:38 -0400] cupsdAcceptClient: 15 from localhost (Domain)
I [14/Aug/2012:12:11:38 -0400] Saving job cache file "/var/cache/cups/job.cache"...
D [14/Aug/2012:12:11:38 -0400] cupsdSetBusyState: Not busy
D [14/Aug/2012:12:11:38 -0400] cupsdReadClient: 15 POST / HTTP/1.1
D [14/Aug/2012:12:11:38 -0400] cupsdSetBusyState: Active clients
D [14/Aug/2012:12:11:38 -0400] cupsdAuthorize: No authentication data provided.
D [14/Aug/2012:12:11:38 -0400] cupsdReadClient: 15 1.1 Get-Jobs 1
D [14/Aug/2012:12:11:38 -0400] Get-Jobs ipp://localhost/printers/
D [14/Aug/2012:12:11:38 -0400] Returning IPP successful-ok for Get-Jobs (ipp://localhost/printers/) from localhost
D [14/Aug/2012:12:11:38 -0400] cupsdSetBusyState: Not busy
D [14/Aug/2012:12:11:38 -0400] cupsdReadClient: 15 WAITING Closing on EOF
D [14/Aug/2012:12:11:38 -0400] cupsdCloseClient: 15

Can anyone give me some idea as to what may cause these jobs to fail?