Had a couple of windows open in a workspace - it was workspace 3, as it happens. One of the open windows was Thunar - call it window A. The other, probably Gedit - call it window B. I was closing down: routine, closing windows. Various windows were open in various workspaces. I Was just closing windows and not paying much attention to what they were.
On closing window B, the Thunar window A maximized to fill the whole screen. It even covered the xfce4-panel. It's title bar was not visible. So it could not be closed or minimized.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: thunar 1.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-34.49-generic 3.8.13.12
Uname: Linux 3.8.0-34-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.5
Architecture: amd64
Date: Thu Dec 12 18:57:11 2013
InstallationDate: Installed on 2012-11-28 (379 days ago)
InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: thunar
UpgradeStatus: Upgraded to raring on 2013-05-14 (211 days ago)
Is this problem reproducible?