Huhhhhhhhhhhhh!
I'm so dense sometimes. Sheesh.
Right click on the object-object properties-G Buffer object channel set to 1 or
Material editor-material assigned with material effect channel set to 1 (or under one of the map channels for more interesting effects), then in the rendering effects-glow element- options tab- images sources object or effects ID set to one of the above choices.
Thanks for jogging my memory a bit.
Dan