set picture as desktop background fails

[Lintor]

Binary package hint: firefox-3.0

Right Click on image > select Set as Desktop Background...
preview doesn't show anything until "position" drop down box is changed.
clicking the Set as Desktop Background does nothing (window remains, background remains unchanged)

ProblemType: Bug
Architecture: i386
Date: Tue Jun 10 23:44:08 2008
DistroRelease: Ubuntu 8.04
NonfreeKernelModules: nvidia
Package: firefox-3.0 3.0~rc1+nobinonly-0ubuntu0.8.04.1
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-18-generic i686