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  28  <H2><A NAME="3_6">3.6 Troubleshooting your installation</A></H2>
  29  <P> For 99% of the users this library will work directly with a recent
  30   installation of PHP without any problem.</P>
  31  <P> Experience shows that most of the trouble are caused by either an
  32   old buggy version of the free-type TTF library or using an old
  33   antiquated version of the GD library. In order to narrow it down the
  34   problem the following steps is helpful.</P>
  35  <OL>
  36  <LI> If no background images are displayed (instead a solid black box
  37   are displayed) chances are that GD 2.x is available but the
  38   jpg-config.inc.php has been changed so that true color images are
  39   disabled. Correct this by enabling the USE_TRUECOLOR define.</LI>
  40  <LI> If background images does not work make sure the settings of
  41   USE_GD2_LIBRARY corresponds to the actual installation, i.e. If the GD2
  42   library is not available then this define must be false!</LI>
  43  <LI> If you are running IIS and Win2k and get the error &quot;Can't find
  44   font&quot; when trying to use TTF fonts then try to change the paths to UNIX
  45   style, i.e. &quot;/usr/local/fonts/ttf/&quot;. Remember that the path is absolute
  46   and not relative to the htdocs catalogue.</LI>
  47  <LI> If no images and no error messages gets sent back to the browser
  48   then there is a big chance that HTTP-Server PHP module (e.g.
  49   Apache-PHP) has crashed. This is often due to a broken PHP installation
  50   and more than often a problem with the True Type libraries. The best
  51   way to track these types of problem down is to investigate the
  52   HTTP-Server logs or the general system logs for evidence of a PHP
  53   crash. The other reasons is that in some rare cases the auto detection
  54   of the GD library could fail. If only the GD1 library is available and
  55   the JpGraph library mistakenly detects the GD2 this could in rare cases
  56   cause PHP to crash. Please try re-run the example by setting the DEFINE
  57   USE_GD2_LIBRARY to &quot;false&quot;.</LI>
  58  <LI> If the system is running IIS on Windows and some images which uses
  59   TTF fonts just return an empty page then try to set the TTF_DIR path
  60   manually (in jpg-config.php) to the directory where all the TTF fonts
  61   are stored (normally c:/WINDOWS/fonts)</LI>
  62  <LI> If the cache is enabled please make sure that the permissions are
  63   correctly set for the cache directory so that the process running
  64   Apache/PHP has write access to the cache directory.</LI>
  65  <LI> If the TTF fonts only shows up as yellow then you have a buggy
  66   installation of the freetype font library and the only thing to do is
  67   to re-install and setup PHP+GD again.</LI>
  68  </OL>
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