The problem still occurs with kpdf version 3.5.8-2+b1 Does API of libfreetype allows to relax strictness of fonts rendering?
BTW, the URL of the pdf file file in question was changed. Now it is http://catchmedia.com/~arie/a/kpdf_invisible_text.pdf Can I attach binary files to bugreport? Should I just send email with attachment? -- Arie