Try (For Mac user click here). Ensure that the latest Flip4Mac v.2.1.1 for Quicktime is installed. If you click and only Quicktime pop up and the video is not playing or VLC is opening, it means that Flip4Mac is not installed or working properly.
Here are the URLs to download Flip4Mac for Quicktime:
If it does not work after installing, you have to ensure windows media player 9 for Mac is installed.