Here's what I did yesterday --
(1) I deleted the dictionary entry, left the vlo-vl object alone, saved the dwg and re-opened it. Vlo-vl object would fire. I did this a couple times to confirm.
(2) I started over and deleted the vlo-vl object, then it's parent dictionary, saved and re-opened - quiet as a door mouse.
Today --
Just performed step (1) again for shyts and gyggles; didn't fire. Did it again, didn't fire.
Damn ghosts in the machine ...