> This looks like a xft2/fontconfig issue, you may want to try upgrading > to the version of libxft2, libfontconfig1, and fontconfig to the ones > in sid.
libxft2, libfontconfig1, and fontconfig were all up to date but I found libqt3c102-mt depended on libxft2. Upgrading libqt3c102-mt to the version in sid solved my problem and kde now works fine :-) Thank you all for your help.