Scrolling doesn't respond immediately, then jumps

Sudden touchpad scroll movement is not recognized for a quarter second or so, then causes the page to jump. More specifically, when I swipe with two fingers (as is my scroll setup - which works on all other parts of the system), it is not immediately recognized. If I rest my fingers on the touchpad first, and then move them, the viewer moves appropriately (most of the time). The problem seems to be when the fingers are swiped (they are moving when they hit the pad and the movement is registered).

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: evince 3.2.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sun Nov 6 20:17:43 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/evince
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: evince
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (23 days ago)