Hi,
This isn't really a problem, just something I've noticed. When doing month based groupings (I haven't checked any others), when drilling down, months are displayed as numbers rather than names. I think I can understand why this would be the case. In the example shown I've tried to change the displayed format, but without success. Not really a problem, more a visual thing. It just feels little like the tight connection between the parent and child displays is broken. This is emphasised when the bottom frame has focus, as the cell highlighting is then cleared in the top frame.
Not a problem ... just an observation
Regards,
Greg