I can't get custom supports working in Cura 3.6 or 4.0b2

[Xeddog 6]

In the attached photo, there are 4 attempts at placing custom supports.  1 - just placing one at the top of the area, 2 - Place one at the bottom, 3 - expand the one at the top all the way down to the surface of the part where I want the supports, 4- starting from the bottom and expanding all the way up the the surface that needs supports.  There are about a dozen other things I have tried to get supports in that space leading up to filling in the space completely, but the result is always the same.  After slicing and switching to layer view there are no supports in place.  At the time of this solid view screenshot, Supports>Touching Build Plate is enabled.     If I switch to Supports>Everywhere, this area gets filled in completely, but so do other parts of the model that cannot have supports and I would have to spend a lot of time blocking certain areas, and there have been a couple of small but critical areas that supports will not block, but that is the opposite issue. 
For now, I went ahead and printed this piece using "Touching Buildplate" supports, and it did ok, but I think it would look much better if that area at the top would have been supported.  So am I doing this wrong, and if so, what do I do to make it happen?  Or is this a bug and if so where would I report it?

[ehays124 0]

Don't ya just love it when you post something that you would like an answer to and no one bothers to even try to give you an answer?