mozilla-thunderbird and drop-down menu transparency

[tony mancill <tony@mancill.com>]

Is anyone else using mozilla-thunderbird and having problems with selection
in drop-down menus?  On my pure64 system, whatever option is
highlighted/selected appears as a solid white bar.  It's odd, because none
of the other GTK-based software I'm running seems to exhibit this problem.
(For example, mozilla and evolution are fine.)  Running from within the ia32
chroot doesn't exhibit the problem, even though I'm using the same home
directory (i.e.configuration files and the like).

It appears to be the same as bug #251389, but that's reported on i386 (and
against a much older version of mozilla-thunderbird).

Thanks,
tony