I have exactly the same problem.
Using xubuntu-desktop 2.112 and xfwm4 4.6.1-1ubuntu2 on top of Ubuntu 10.04.1 LTS
I have exactly the same problem.
Using xubuntu-desktop 2.112 and xfwm4 4.6.1-1ubuntu2 on top of Ubuntu 10.04.1 LTS