First of all it seems like solar panel 6 does not show up anymore in Enscape 4.0. I had plenty of them in my model, but after upgrading to 4.0 they do not show in render, only in sketchup. I am not sure if this is due to me grouping them?
Second of all, everything dissapears in Enscape when I try to put down a new object from Enscape assets. The only way to get back is to restart enscape.