Cannot drag windows between workspaces in Expo during recording

Steps to reproduce:
1) Start recordmydesktop (or gtk-recordmydesktop) and start a screen recording. Have another window open.
2) Click the Workspace Switcher icon in the Unity launcher or use the Super+S key combination to enter Expo.
3) Try to drag the window you have open to another workspace.

What should happen:
The window follows the mouse cursor to the other workspace and gets relocated there.

What happens instead:
The window stays put where it is.

Workaround:
Right-click the window titlebar in the normal desktop view and select one of the options to move it to another workspace.

I am reporting this from Ubuntu Precise 64-bit.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: recordmydesktop 0.3.8.1+svn602-1ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
Uname: Linux 3.2.0-8-generic x86_64
ApportVersion: 1.90-0ubuntu2
Architecture: amd64
Date: Sat Jan 14 18:19:36 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: recordmydesktop
UpgradeStatus: Upgraded to precise on 2011-12-13 (32 days ago)