So it looks like the issue might be with X-Loot. In the ticket I created, one of the devs gave me a replacement Group.lua file to use to test Bonus Roll popup windows. It does indeed add functionality to create a fake Bonus Loot roll window, and it works. However regular [real] Bonus Loot roll windows also started working fine again. And when I put the previous (current version from Curse) Group.lua file back in place, the Bonus Loot roll windows stopped working again. I informed the dev in the ticket, and we'll see what happens next.
For now...zzzZZZZ
p.s. - Disabling/re-enabling the AlertFrame mover module in RealUI had no effect on the results.
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