Display problems

Hi -I have a Velleman K8200 3D printer - I have had various problems in building it, but finally all the bits seem to work, but nowv I find that on my PC running Windows 7, the host interface opens, but doesn't show the object-placement box, just a black area where it should display. & the circuit board cover (an stl file) tries to load, but stalls. On my laptop, running Windows 8.1, the host window opens fine, placement box is where it should be, but the boardcover.stl file just won't open, yet the  'tablet file, an 'amf' file, loads up & slices fine. Can anybody help, as I want get the board cover to cover the wiring. Thanks
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