Lost prints ReadClient() 5 IPP Read Error!

[Jez]

>
>>>
>>>>We are experiencing intermittent lost prints using cups 1.1.19 on RedHat
>>>>6.2 (built from source). We use system V style interface scripts written
>>>>in perl.

> 
> Set your log level to debug2 and see what debug messages are around 
> this error.
> In any case your cupsd tries to issue an IPP request which somehow
> fails.
> 
> Helge
> 

I have done as requested. The log file is huge, an abridged version 
(263k) is at

http://www.appo15.dsl.pipex.com/cups/error.txt

I'm quite happy to admit that I can't make head nor tail of it.