This looks like the 'Rodent' theme in gtk.
Apparently qt apps under any different user can not automatically pick up the desktop theme.
gksudo -u youruser qtconfig
from the command line. If it is not installed, install it with
sudo apt-get install qt4-qtconfig
. Then set GUI Style
at the first, appearance
tab. Save and exit. Subsequent 'sudoed'
qt applications will pick up the running GTK theme.
However this might affect the looks of these apps when run under KDE. Perhaps file a bug report with the qt makers.
Effective today, 2013-02-27, there is a
qt-chooser-package in updates which might help these issues.