I have just upgraded my laptop running Debian Testing/Squeeze. This caused KDE 3.5 to be replaced with KDE 4.
I have set up 6 workspaces under KDE 4 and if I log out or shutdown and reboot then go back into KDE there is only one workspace shown. If I do the same again I go back to 6 workspaces - ad infinitum.
Why should the number of workspaces alternate like that?