When this happens, do other messages still display immediately, or are they affected as well? If the latter, this report should probably be marked as forwarded to http://bugzilla.gnome.org/show_bug.cgi?id=575229 which I just reported.
Out of curiosity, are you also using the 'Prefer plain-text' plugin, and if so what are its settings on the Mail Preferences -> HTML Messages pane? -- Earthling Michel Dänzer | http://www.vmware.com Libre software enthusiast | Debian, X and DRI developer -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org