Email Notification to Project Group

[paul.fowler]

Hi,
We have an Administrator reporting the following problem. When you upload or modify a document on a Project you are promoted to add a comment and then to "Send an Email Notification". You then click on the "To" button and add your two groups (says Group A & Group B) and click "Finish". This email notification is sent to members of Group A but not to members of Group B.

They are running 2009.1.11215.570.
The groups are Project Groups. They have tried recreating the Group that fails, however they say that the problem persists.

Do you have any ideas on where we should look?

Regards
Paul