I think you uncovered the mystery - I had the script set on the campaign instead of on the in-group. I just switched it over to the in-group and it started displaying
Thanks!
One thing though - it looks like when the text is displayed, normal spaces between words are instead filled with plus (+) signs. So text in the agent script screen reads like this:
Hello+this+is+a+test+screen
Any idea what might cause that to happen?