Possible bug in spotlight fixtures in color field

[mjm]

So today in 2017 I have been rendering a gobo in a spotlight fixture. All good till I changed the color from White (empty field in the color field of the OIP) to red (R27 in same place, then I switched back to White by deleting the value in the OIP. The fixture acted as if I'd turned it off, tho showed on in the Vis Palette and right-click menu. Investigating by choosing "edit light" from right-click menu, showed the color as black.

Bug?

This is not how it's worked up till  V2017.

Fixed soon? Hoping so.

Also, the Shutters still fail regularly and the crappy workaround is to block the beam with an extrusion.

And Use Vertical Beam seems to flop shutters from right to left. I haven't experimented with Top or Bottom in that regard yet.