when invalidating or replacing the center component in a border layout there is a flickering which did not happen in ZK 6.5 (tested with 6.5.7) with more complex contents the flickering becomes more obvious, and more irritating, making the UI look less robust.

in the attached example the flickering is highlighted with different background colors also visible in this video http://screencast.com/t/LxSg43ZSy (after 0:09 - the flicker actually happens more often but the video only captured one occurrence due to limited frame rate)