Table "OS/2' does not exist in /System/Library/Fonts/AppleGothic.ttf

The fix is already submitted to the version control and I will rebuild the distros next 
days. Until that, you may do one of the following (in descending impact on GP 
features) with the ZIP distribution:
* remove org.ganttproject.impex.htmlpdf plugin from GP installation directory
* disable iText based export only: open 
plugins/org.ganttproject.impex.htmlpdf_2.0/plugin.xml file in any text editor and 
remove line "<exporter class="org.ganttproject.impex.htmlpdf.ExporterToIText"/>"
* don't use MacOSX system fonts: open the same file and remove line <dir 
name="/System/Library/Fonts" absolute="true"/>