"Send to workspace x" works, but also changes window's location

Using this in Ubuntu 13.04 moves the window to workspace x, but also shifts the window up and left by amounts that appear to be equal to the frame thickness in those directions (i.e. the upper-left corner of the window's content is positioned where the upper-left corner of the frame used to be).

I'm using sawfish as the session through .xinitrc. I have "Send to workspace x" bound to Super-M-Fx.

This didn't happen under 12.04 LTS, under KDE using $KDEWM=sawfish. I didn't try running sawfish separately on my 12.04 system...

I'll note that the version of Sawfish shipped with Ubuntu (and all current versions of Debian) is 1.5.3, which was released 3.5 years ago (http://sawfish.wikia.com/wiki/2009_11_12:_sawfish_1.5.3_released). The current Stable sawfish is 1.9.1, released 0.66 years ago (http://sawfish.wikia.com/wiki/2012_09_01:_Sawfish_1.9.1). Perhaps shipping a more recent version of sawfish with Ubuntu would be an expedient way to fix this bug--and probably others?

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: sawfish 1:1.5.3-2.1ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Sun May 19 16:02:28 2013
InstallationDate: Installed on 2013-05-18 (1 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: sawfish
UpgradeStatus: No upgrade log present (probably fresh install)