Hi,
  I wonder if this is due to a hardware limitation; some cards can't handle 
more than 2048 pixels across.

Please provide:

the output of    lspci | grep -i vga
the resolution of the two monitors
a copy of your /var/log/Xorg.0.log

Dave

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Dual-monitor possible with top-bottom screen configuration only
https://bugs.launchpad.net/bugs/651994
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