Alt+Tab switches windows. But switching in reverse order using Alt+Shift+Tab, not working in 9.10

[amitm]

Binary package hint: nautilus

As of Ubuntu release 9.10, I'm unable to switch between windows in reverse order. Alt+Tab is working fine but Alt+SHIFT+Tab isn't working.
Upto 9.04 (I'm using Ubuntu since 8.04) I could reverse switch between windows using Alt+SHIFT+Tab

Other details:-
Nautilus version - 1:2.28.1-0ubuntu3

ProblemType: Bug
Architecture: i386
Date: Sun Dec 13 16:27:08 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/nautilus
NonfreeKernelModules: wl
Package: nautilus 1:2.28.1-0ubuntu3
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
SourcePackage: nautilus
Uname: Linux 2.6.31-16-generic i686