RBob - 2017-01-30

Hi all,
some time ago I developed an application that uses some GLScene objects including a GLDirectOpenGL one.
Now I need to frequently run the application on a virtual machine (by mean Oracle VM VirtualBox) and the GLScene objects are displayed correctly except the GLDirectOpenGL that displays only a white stain: is there a way to sort it out?

thank you,
RBob

PS: I've already to turn on the 3D accelerator on the virtual machine options but nothing changes