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OK. I’ve only looked at the Basement Plan page so far. As you wrote last night, the viewport was locked. When I unlocked it, the rendering started immediately and updated. After updating it looked like this:
I opened the SketchUp model file and added a hexagon, saved the file and went back to LO. The viewport updated to show my change as expected.
Removing the hexagon and saving the change to the SketchUp model also rendered immediately.
I did do a bit of cleanup in your SketchUp model. There were a few edges and faces that were incorrectly tagged.
And a lot of unused stuff to purge.
That reduced the LayOut file size by a little more than 83%. It also helped to speed things up in both SketchUp and LayOut. I didn’t go through the styles but from looking at your LO file, I’d bet my lunch money that you don’t need all 14 of the remaining styles for this model. Eliminating the unneeded ones wouldn’t change the file size much but it would make the model easier to deal with.