I am also experiencing this bug. I have a IBM Thinkpad X41, and running
the latest version of Feisty, clean installed, and using thinkfinger,
following the guide on the Ubuntu wiki.

Logging in via gdm works fine.
sudo from a terminal works fine.
gksudo does not appear - and even after swiping a finger, the application does 
not appear.
A "killall gksu" is required in order to execute the application. If this is 
not done, then further sudo-s and gksudo-s will function as they did without 
fingerprinting - ie. sudo will not ask for a fingerprint, and gksudo will 
appear and ask for a password, as it did before.
If gksudo was run from the console, then a Ctrl+C will do the same job. The 
fingerprint is correctly verified though, as killing gksu without a valid 
fingerprint will not launch the application.

Does anyone know where this bug lies? With gksudo (and it's
implementation?) I have googled a fair bit for this - and collected many
opinions. One is that gksu/gksudo does not have permission to grab the
screen because it is being executed by pam_thinkfinger which is being
run as root. Does anyone know if this bug applies to any other distros,
or is it specific to Ubuntu too?

-- 
modifying PAM configuration could break gksu
https://bugs.launchpad.net/bugs/86843
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