Second time CUPS sends pcl6 to postscript printer

[jowyta]

If I switch my Samsung ML-2550 printer off and on again and then print a 
document (from LibreOffice) it prints correctly.  If I then try to print 
the document again, or anything else, the display on the printer says 
"Printing PCL6" and I get a single page with a row of /.notdef s on it.

Attached are relevant parts of error_log.  Job 141 printed correctly, 
142 did not.

Anyone any ideas what is going wrong?

John
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