diff -up meshlab-2016.12/src/meshlab/main.cpp.ply-numeric meshlab-2016.12/src/meshlab/main.cpp

--- meshlab-2016.12/src/meshlab/main.cpp.ply-numeric	2017-07-20 10:34:13.984353084 -0400

+++ meshlab-2016.12/src/meshlab/main.cpp	2017-07-20 10:34:30.278972616 -0400

@@ -31,6 +31,7 @@ int main(int argc, char *argv[])

     MeshLabApplication app(argc, argv);

     QLocale::setDefault(QLocale::C);

     QCoreApplication::setOrganizationName(MeshLabApplication::organization());

+    std::setlocale(LC_NUMERIC, "C");

 #if QT_VERSION >= 0x050100

     // Enable support for highres images (added in Qt 5.1, but off by default)

     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);