Thanks, Erich! You were spot on! I hadn't tried that because QlikView shows groupname with a red underline in that expression, suggesting the expression isn't correct.
It appears that QlikView isn't consistent in the way it reports the value of a group.
For example, if I simply if I use any of the following in the window title field, the value of the group is not displayed
If, however, I use this in the window title field, the value of the active element in the group is displayed!
So, for some odd reason, QlikView requires you to use getcurrentfield() in some cases and not in others. It's frustrating to say the least.