Sometimes, when clicking the ‘All Files’ link in SharePoint Designer, you may get a message ‘Building Report’, and it will seem to get ‘stuck’ there.

Chances are, the ‘report’ as such is already built, but something internally is keeping it from being displayed. Try clicking on one of the other links in the Site Objects list, and then go back to the ‘All Files’ link. It should be able to be displayed, then.