+ when creating picture check whether pbuffer is supported

src/Gui/Thumbnail.cpp

@@ -30,6 +30,7 @@
 # include <QDateTime>
 # include <QImage>
 # include <QGLFramebufferObject>
+# include <QGLPixelBuffer>
 #endif
 
 #include "Thumbnail.h"
@@ -86,8 +87,9 @@ void Thumbnail::SaveDocFile (Base::Writer &writer) const
     if (!this->viewer)
         return;
     QImage img;
+    bool pbuffer = QGLPixelBuffer::hasOpenGLPbuffers();
     if (App::GetApplication().GetParameterGroupByPath
-        ("User parameter:BaseApp/Preferences/Document")->GetBool("DisablePBuffers",false)) {
+        ("User parameter:BaseApp/Preferences/Document")->GetBool("DisablePBuffers",!pbuffer)) {
         this->createThumbnailFromFramebuffer(img);
     }
     else {