Natty 11.04 released -- gnome-panel 1:2.32.1-0ubuntu6.4 is in 'natty-proposed' and the problem is still present.
I followed Craig's instructions in https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/43066/comments/39 , replaced the gnome-panel package (and only the gnome-panel package), and the window-list applet doesn't have the strobing effect when oriented vertically anymore. No need to change the libwnck22 package, just 'gnome-panel'.
Natty 11.04 released -- gnome-panel 1:2.32.1-0ubuntu6.4 is in 'natty-proposed' and the problem is still present.
I followed Craig's instructions in https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-panel/ +bug/43066/ comments/ 39 , replaced the gnome-panel package (and only the gnome-panel package), and the window-list applet doesn't have the strobing effect when oriented vertically anymore. No need to change the libwnck22 package, just 'gnome-panel'.