1) Select two or more adjacent columns
2) Column>Header>"Group Columns"
3) In many cases, the Group Columns command is grayed out and can't be applied. In other column selections, it's there and works correctly.
So far, it's just one grid that's doing this and it started after I did an "ungroup all" command (no idea if it's unrelated).
Wayne
Edit: I'll leave this here since it might be a reproducible bug but when I rebooted InfoQube, it cleared up.