Window borders are missing on VMs in Unity

[Hariharan Iyer]

I'm running a Windows 7 VM in Virtualbox. When the VM windows is un-maximized, there are no window borders on the VM window. Therefore manipulation of the window (e.g. resizing, moving) is impossible. I will attach a screenshot to illustrate the problem.

Version information:
lsb_release -rd
Description: Ubuntu oneiric (development branch)
Release: 11.10

apt-cache policy virtualbox
virtualbox:
  Installed: 4.1.2-dfsg-1ubuntu1
  Candidate: 4.1.2-dfsg-1ubuntu1
  Version table:
 *** 4.1.2-dfsg-1ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: virtualbox 4.1.2-dfsg-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Tue Oct 4 13:23:23 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
SourcePackage: virtualbox
UpgradeStatus: Upgraded to oneiric on 2011-09-06 (27 days ago)

[Hariharan Iyer (hariharan-iyer)]

The screenshot shows the VM window with the borders missing. As you can see it's impossible to resize or move the window, and difficult to select outside it.