Hi.  I don't know if it's a problem with where a tarball release is created but some C++ modules (such as gtksourceviewmm and gstreamermm) don't show the regular Doxygen sections (such as "Modules", "Namespaces" and "Classes") that are regularly seen under the documentation title in other modules such as glibmm.  See for example gstreamermm's main page:

http://developer.gnome.org/gstreamermm/unstable/

as opposed to glibmm's main page:

http://developer.gnome.org/glibmm/stable/

This makes the documentation of the affected modules practically inaccessible and almost unusable.  If there's something that can be done from this side I'd happily make the necessary changes.