In VW 2019, Viewport Sections with Section Lines that have jogs seem to lose their fill at the section plane.  This doesn't seem to always happen; it seems as though it may depend on how the section line relates to geometry in the model.  But in complex (i.e., real world...) project files, it does seem to always happen (I'm assuming this is because there's so much more geometry that the section line passes through...).  This isn't an issue in VW 2018, where fills are as expected, in all cases.