Pan and Zoom preview delayed

Whenever I apply a Pan and Zoom effect to a still image, the resulting preview in the project monitor is not shown until I actually click on the clip in the timeline. If I don't click on the clip, all that shows is the same yellow box from the Pan and Zoom window. The work around is to click on the clip but is this how it's supposed to be?

Mandriva 2010.1
Kdenlive 0.7.8