If an OTF file is placed in the font directory, it is not loaded into the font database. QFontDatabase::addApplicationFont can be used to work around this, but it is a bit annoying.

Patch to fix the issue:

— qfontdatabase_qws.cpp.orig 2010-08-24 09:28:49.580816196 +1200
+++ qfontdatabase_qws.cpp 2010-08-24 09:32:56.409072789 +1200
@@ -354,7 +354,7 @@
#ifndef QT_NO_FREETYPE
dir.setNameFilters(QStringList() << QLatin1String("*.ttf")
<< QLatin1String(".ttc") << QLatin1String(".pfa")

• << QLatin1String("*.pfb"));
  + << QLatin1String(".pfb") << QLatin1String(".otf"));
  dir.refresh();
  for (int i = 0; i < int(dir.count()); ++i) {
  const QByteArray file = QFile::encodeName(dir.absoluteFilePath(dir[i]));