When using WP-Filebase built-in PDF indexing mechanism, you might find a lot of error messages like “File has unbalanced q/Q operators (too many Q’s)” in your server’s log files, filling up the hard drive and keeping the CPU busy.
This is caused by to a bug in an old version of Ghostscript, occuring only with some PDF documents. Here are three options for a fix:
- Use our Advanced Indexing extension. It uses a webservice for indexing and does not require Ghostscript to be installed on your server
- Disable PDF indexing (just set the Ghostscript path to /bin/false), this will stop WP-Filebase from running Ghoscript at all, but PDF indexing is not available anymore
- Update ghostscript to >= v9.15. Try the package manager of your linux distriution first (such as apt-get upgrade). If this does not help compile Ghostscript from its sources
For more details about the bug see https://bugs.ghostscript.com/show_bug.cgi?id=693916
Versions known to have this bug:
- GPL Ghostscript 9.10 (2013-08-30)