Upstream openscenegraph consider this probably a Qt bug (http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2014-January/065939.html), possibly one of these: https://bugreports.qt-project.org/browse/QTBUG-31935 https://bugreports.qt-project.org/browse/QTBUG-200 https://bugreports.qt-project.org/browse/QTBUG-24528
They also can't reproduce it, which suggests it may be hardware dependent.
Upstream openscenegraph consider this probably a Qt bug (http:// lists.openscene graph.org/ pipermail/ osg-users- openscenegraph. org/2014- January/ 065939. html), possibly one of these: /bugreports. qt-project. org/browse/ QTBUG-31935 /bugreports. qt-project. org/browse/ QTBUG-200 /bugreports. qt-project. org/browse/ QTBUG-24528
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They also can't reproduce it, which suggests it may be hardware dependent.