Is this just in preview - or if you generate a rendering do you see those lines? This looks like something that would be affecting preview only and could be related to a model and/or textures that are more than your graphics card can handle.
(You say the 'rendering window' - but there isn't such a thing. There is a preview window, which is an approximate rendering and then there is the actual render, which has just a progress window during the calculation, but isn't the render - you have to open up the saved file to see that.)
Is your model far from the origin in ArchiCAD? That can cause weird lines. Check that you do not have a user origin active. In plan view, double click the origin button to reset any user origin and put the bold origin 'x' at (0,0). Now, measure if anything that would appear in 3D is far (as in over a mile) from the origin.
Could be related to smoothing... with the Shader inspector active, select a surface that shows the lines and drag the smoothing slider towards the right, halfway should be enough; fully to the right if that doesn't help. Wait for the preview to regenerate.
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