Using the 173.14.18 legacy driver I also have this problem. Oddly the
mouse never seems to get stuck on the central screen. However, sometimes
the mouse will be on the middle screen, while highlighting text the
mouse will act like it is located on either one of the outer screens
performing the action there (for example selecting text on the inner
monitor could result in highlighting an area of the desktop on the left
or right screen). When attempting to move the cursor from the central
screen it will then warp (presumably by one screen width) and get stuck
wrapping on an edge screen.

However, on a newer machine where the 185.19 beta driver can be used
this bug is not a problem. In both cases the machines are using the
patched xserver from the m0sia ppa to resolve the cursor left on each
screen (bug #357901).

Kris, do you have the chance to try the Nvidia 185.19 beta driver?

Also, when your cursor becomes stuck if you drag a window the first
screen crossing it makes the cursor moves as expected but the window
itself warps now, followed by crossing the next boundary with the window
snapping to the cursor position and the cursor becomes un-stuck?

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Mouse cursor wraps around current screen when animated using Xinerama
https://bugs.launchpad.net/bugs/383209
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