They are static shapes. 16.5 and later reverts to the "pre-16.0" display for static shapes, the shapes are also static in the Artwork Import but the Gerber data is "pen or no-pen" shapes will be filled correctly. You can restore the "post-16.0 (to 16.3)" behaviour through Setup>User Preferences, Display, Opengl, static_shapes_fill_solid. Remember that "Transparency" will also be on so tweak this to 100% for the Global and Shapes in OpenGL settings in Display>Color/Visibility, Display folder, if you wish.