Yosemite printer panasonic DP C265 not print. Says: "Stopped - 'Filter' failed" 21/04/15 22:14:15,014 powerd[48]: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "(null)".
21/04/15 22:14:19,195 sandboxd[405]: ([1457]) foomatic-rip(1457) deny file-read-data /usr/local/etc/foomatic/filter.conf
21/04/15 22:14:19,233 _192_168_15_20[1455]: The function ‘CGContextErase’ is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance.
21/04/15 22:14:19,579 sandboxd[405]: ([1461]) sh(1461) deny file-read-data /dev/tty
21/04/15 22:14:19,598 sandboxd[405]: ([1461]) sh(1461) deny file-read-data /
21/04/15 22:14:19,619 sandboxd[405]: ([1465]) bash(1465) deny file-read-data /dev/tty
21/04/15 22:14:19,638 sandboxd[405]: ([1465]) bash(1465) deny file-read-data /
21/04/15 22:15:15,015 powerd[48]: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "(null)".
It IS being sandboxed. One solution is to disable sandboxing:


  Edit /etc/cups/cups-files.conf and add this line: "Sandboxing Off",
  restart cups: "sudo launchctl stop org.cups.cupsd"


However, another user has written a script which identifies those printer descriptions which need explicit path/to/file information, and automagically adds it. 

I have used this script to allow me to print to my HP 5850 from Yosemite. My other printers (modern drivers) were not affected.

This solution is not mine. I found this answer through others' answers here  (https://discussions.apple.com/message/26887951#26887951). Good luck!