adding new activities, but cashew is gone

[tleskac]

After upgrading to KDE 4.3 beta 1 i decided to add activities because there is posibillity to connect them with virtual desktops. But ... there is no cashew after upgrade (don't remeber if there was before ) Is it some way how to enable cashew?
Interesting thing is I upgraded 2 machines - one is ok with cashew, but the second one there is problem, and of course the second one is more important for me

[caf4926]

Right click desktop - appearance and choose as highlighted