OS Ver: Ubuntu 11.04
Gnome-Gmail Ver: 1.8.1
When trying to send a file as an attachment from Nautilus, a new tab is opened for Gmail but the 'To:' line just contains a number.
In the file '/usr/share/applications/gnome-gmail.desktop', changing the 'Exec' line from:
seems to fix the problem.
However, I'm not sure what '%s' actually means, as it is not mentioned in the Desktop Entry Spec (http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html). I just see it used in a different .desktop file.