At first, everytime I apply any of the lines below
\usepackage[adobe-garamond]{mathdesign}
\usepackage[Adobe Garamond]{mathdesign}
\usepackage[mdpgd]{mathdesign}
my code compiles but does not produce a pdf document. After some troubleshooting, I found out that it doesn't work when I set something to bold style.
I then installed the opentype fonts as indicated in the documentation of mathdesign package (see http://www.ctan.org/tex-archive/fonts/mathdesign/). Relevant files are
AGaramondPro-Regular.otf
AGaramondPro-Italic.otf
AGaramondPro-Semibold.otf
AGaramondPro-SemiboldItalic.otf
Fortunately, it worked! However, another problem arose; the ligatures don't work!! For example,
is supposed to be may be effective in, but the ff ligature turned into a box. What can I do to make the ligatures work?