I can confirm the same, warehouse is blank in SketchUp Make 17, even when signed in. The same is true in Pro 18. SketchUp 20 and 21 are working as expected.
The 3D warehouse can be accessed via web browser here:
I can confirm the same, warehouse is blank in SketchUp Make 17, even when signed in. The same is true in Pro 18. SketchUp 20 and 21 are working as expected.
The 3D warehouse can be accessed via web browser here: