'Group By' Summary Duration Incorrect

[hmcleay]

Hi All,

I've got a small programme in MS Project 2010, and am using 'Group By' function to summarise various phases.

The summary value for 'duration' is not calculating correctly. Is showing the maximum duration within the group, rather than the latest finish minus earliest start. The start and finish dates for the summary bar are showing correctly though.

I have all my durations entered as weeks, and have tried changing the setting for "duration is entered in..." box in the options menu, with no success.
The problem still exists if I change my durations to days rather than weeks.

This problem doesn't occur with MSP 2007.

Any suggestions?

Thanks,

Hugh.