What version of artlantis do you have?
I use for years only the branch artlantis studio. It is actually very simple, as long as you are not completely fasting the concept of "creating a texture". you can click on "create a new material" (or something like that) and a screen appears to be "compiled" with various bumps, normal, reflection, etc., to which you can also vary the depth values. They are generally good.
not having noticed the change I think depends on this: you import from archicad an object to which on archicad you have already assigned a material with a texture, like bricks. when you give him a new material with artlantis, he does not replace everything, but adds. you should therefore from the pranked materials (or object, I escape at the moment) eliminate the old texture of archicad. I use archicad 12 and arthlantsi studio 2. with these two the export of the model from archicad is facilitated by a scermata that asks me what to export, there I can uncheck the textures and avoid some problems on atl.
Look, it's not that I'm not used to working in lightworks, it's that I don't like the results that come out, in relation to the time you use to set all the parameters for good. Incidentally, the rendering you posted before is good according to me, but not exceptional, probably not complete yet. is a demonstration more than anything you can do with atl without losing a whole game.