cursor jumps between dual monitors

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http://www.linuxquestions.org – My Xubuntu machine has an nvidia card and dual monitors set to display separate X sessions. Unlike in twinview (where moving the cursor to the edge of one monitor causes it to appear on the corresponding edge of the other) in this mode, the cursor jumps from the edge of the first monitor to (roughly) the center of the second monitor. This isn't just distracting -- it makes the setup almost unusable. I know there are utilities out there that will lock the cursor onto one monitor or the other, but what I'd really like is to find some way of controlling the way the cursor translates between scree (HowTos)