A new release of Stacks will be available very soon for download, all these new stacks will have version 1.5 

We have taken the opportunity to also update some of the core code as well as fixing the centering of the video in IE. We have also included an additional option in the Add Media stack for changing the Flash wmode parameter by default it is set to transparent. However, you may want to switch this onto opaque mode if you are having problems of HTML hiding behind the flash window.