Mark, I tried to install the support of the PDF images at 1.21.0rc1 but it does not work. The www.mediawiki.org/wiki/Extension:PdfHandler indicates that first I should get the MacPort. I had no idea, what MacPort is, but I downloaded it from the source recommended. I tried to make the default configuration. The installer had created user "macports" and group "macports", suggested to read "man port", but neither manual of "port", nor the command "port" appears. No executable "port" seems to be generated. Should I learn to install and to use the "macports" (as I did with MySQL and PHP), or there exist some easy way to way to say to mediawiki, that I want it to allow loading files also in the PDF format? Did you test the extension with MediaWiki 1.21.0rc1 ? Did you have to learn macport in order to do this?