Group button on toolbar does nothing?
 

Watching the tutorial videos and in the images in the fine manual I see an icon that represents grouping. But in my Omniplan it is always a silhouette of a person in curly braces.

Yes even when I'm in the gantt chart with a task or tasks or a group selected.

That appears to be a regression -- the copy of 1.6 I still had works properly. I'll write up a bug report. You can still group with the keyboard shortcut (select some items, type shift-G, or cmd-option-L) or the menu (Structure->Group). I'm so used to doing it with the keyboard that I don't even notice the toolbar button any more, and had to fire up the app to see what you were talking about! I suspect the QA group had the same blind spot...

Same true with Add Child button
 

I believe this same bug struck the Add Child toolbar button. It too seems perpetually grayed out.

This problem has been fixed in OmniPlan 1.6.3.

-Tom