The latest (~x86) mozilla-thunderbird 1.5 seems to have two cosmetic bugs. When user goes to Edit->Accounts Settings->[Pick an account]->Advanced. The dialog box no longer has the tab for SMTP outgoing. It forces all SMTP outgoing to the default SMTP outgoing settings. This is a major problem for user email account that checks login email address against sender email address for preventing spamming. In addition, when user goes to Edit->Preference, the Advanced button under "When New Messages Arrive:" does not seem to have enough real-estate in the UI. Letter are stuck out of the button no matter how one resides the dialog box.
Here is my emerge info if it can be any use. ccache version 2.3 [disabled] dev-lang/python: 2.3.5-r2, 2.4.2 sys-apps/sandbox: 1.2.12 sys-devel/autoconf: 2.13, 2.59-r6 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1 sys-devel/binutils: 2.16.1 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium4 -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /opt/openjms/config /usr/kde/2/share/config /usr/kde/3.3/en v /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/ share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr /lib/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/splash /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -march=pentium4 -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/ distributions/gentoo" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="x86 X aalib acl acpi adns alsa apache2 apm arts audiofile avi berkdb bindis t bitmap-fonts bzip2 caps cdr cjk crypt cups curl dga directfb divx4linux dvd dv dr ecc eds emboss encode esd ethereal exif expat fam fbcon ffmpeg flac foomaticd b fortran gd gdbm gif glut gmp gnome gnutls gpm gstreamer gtk2 gtkhtml hal harde ned idea idn ieee1394 imagemagick imlib ipv6 java javamail jikes jpeg junit jyth on kde lcms ldap libg++ libwww mad mcal mhash mikmod ming mmx mng motif mozilla mp3 mpeg mysql nas ncurses nls nptl ogg oggvorbis opengl oss pam pcre pda pdflib perl pic png postgres python qt quicktime readline real rhino ruby sdl skey snd file snmp socks5 speex spell sqlite sse ssl svga tcltk tcpd tiff truetype truety pe-fonts type1-fonts udev unicode usb v4l vcd vorbis wmf xine xml2 xmms xprint x v xvid zlib userland_GNU kernel_linux elibc_glibc" Unset: ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS, MAKEOPTS
Hmm... Just verified same thing happens to MS Windows platform.. so it is definitely a bug on mozilla-thunderbird.
Marking upstream, there's nothing we could do about it, sorry. :)