Hello, Marblewidget does not compile on MSVC2010 due to the usage of the QObject::QObject::tr() statement in MarbleAboutDialog.cpp, lines 207-278. Should be QObject::tr() instead of QObject::QObject::tr(). Compiler Error C3083: The symbol to the left of a '::' must be a type. A function was called incorrectly. J. Puhr