Interesting, denials can result in strange behaviors/bugs/crashes but I
am going to atm just focus on fixing the apparmor confinement. Which
rule addition did you try?

If you haven't tried it yet, does using
   /usr/local/lexmark/** Ux,
instead of
    /usr/local/lexmark/08zero/bin/printdriver rix,
result in a different behavior?

Also can you provide some timestamps, and md5sums of the cache file?

do the following after reboot, and then again after the apparmor_parser command
  ls -l /etc/apparmor.d/cache/usr.sbin.cupsd
  md5sum /etc/apparmor.d/cache/usr.sbin.cupsd

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https://bugs.launchpad.net/bugs/1187970

Title:
  apparmor prevents custom printer driver from executing

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