It's virtualbox issue. To clear things up. SDDM is using advanced OpenGL features through Qt5. In case of virtualbox there is a well know issue that after some 4.x version vbox lost it's ability to properly handle OpenGL (3D acceleration). Make sure you have installed latest vbox additions, sometimes it helps.
My suggestion (also for myself :) is to use different virtualization tool, as vbox is becoming dead end.
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