Kupfer Preference box appears behind other windows

I'm running Kupfer 207 following a download direct from the project page yesterday. However I think I've experienced this with various versions of Kupfer.

I have Kupfer running fine in general. It responds to the keyboard shortcut to appear, and can handle typed commands.

However, when I choose 'Preferences' from the drop-down menu in order to configure plugins etc. nothing appears. I've discovered that the Preferences window is behind all other windows.

A fairly simple workaround is to find the preferences window in your launcher/taskbar or use the System>W Keyboard shortcut (on my version of Ubuntu) which allows you to see all windows, then select it to bring the window to the front.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: kupfer (not installed)
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Tue Apr 10 09:48:30 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: kupfer
UpgradeStatus: No upgrade log present (probably fresh install)