I am having this problem also. I can set the number of workspaces and their names only when Desktop Effects are disabled. By default the desktop effects were set to "Normal effects".
I think I am running 7.10 tribe 4 or 5 (I installed 4 from CD and it did an upgrade last night which includes the new multiple monitor config tool).
Uname: Linux forrest-ubuntu 2.6.22-9-generic #1 SMP Fri Aug 3 00:50:37 GMT 2007 i686 GNU/Linux
gnome-panel is version 1:2.19.6-0ubuntu1
I am having this problem also. I can set the number of workspaces and their names only when Desktop Effects are disabled. By default the desktop effects were set to "Normal effects".
I think I am running 7.10 tribe 4 or 5 (I installed 4 from CD and it did an upgrade last night which includes the new multiple monitor config tool).
Uname: Linux forrest-ubuntu 2.6.22-9-generic #1 SMP Fri Aug 3 00:50:37 GMT 2007 i686 GNU/Linux
gnome-panel is version 1:2.19.6-0ubuntu1