Web part problem

[D.D.]

Hi,

I've got a little problem when using Web parts in Project Web Access.
When I click on Documents, View and upload public documents
Then I choose a library.
Click on New Document (and give it a name and create it)
Then normally I can add some webparts that already built-in (like Project
Timesheet).
Here I got the problem that I can't see these webparts.

On the other hand when I do the same thing but then choosing View and upload
documents in all projects instead of View and upload public documents
(all the rest stays the same), I can see these built-in webparts.

Anyone any Idea? In the information Microsoft provided I should see them in
the both ways, so...??

Thanks in advance