I've struggled with twinview as well before upgrading to 3 monitors. It
will do it's own xinerama type implementation, but I've noticed that the
nvidia-settings does not turn off xinerama in the xorg.conf if it has
already been set. This is usually only a problem if you merge settings
when saving your xorg.conf.

Double check your xorg.conf and make sure you don't still have xinerama
enabled, then reboot. That may prevent the task bar from spanning across
two monitors.

on a side note, I read that 8.10 was supposed to be implementing some
new Xrandr features, that were supposed to allow those of us with
multiple displays to can xinerama, but I have yet to figure out how to
make that work, or if it's possible with the proprietary nvidia drivers.

-- 
X.org will intermittently stop responding to mouse clicks on Ibex with Xinerama
https://bugs.launchpad.net/bugs/296167
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