I tried a few more things out.

Beyond enabling the "Extended Leaders / Team" option, and setting "Display group in legend" for a group, are there ANY other variables that affect whether a user group will appear in the Team block?

Only three of the five pre-defined PHPBB3 groups I enable appear ...

Your Portal Version: 1.04
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Basic Knowledge
Boardlink: http://localhost

What have you done before the problem was there?
This is not so much an encountered problem as it is a feature I'm trying to enable.

What have you ...