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CUPS pstoraster problem
If you get error messages such as the following in your CUPS error_log, it may mean that CUPS was upgraded but not restarted. Restarting CUPS fixed the problem for me anyway.
E [10/Oct/2011:20:53:05 -0500] Unable to execute /usr/libexec/cups/filter/pstoraster: No such file or directory
E [10/Oct/2011:20:53:05 -0500] [Job 163] Unable to start filter "pstoraster" - No such file or directory.