I'm going to assume that this problem is fairly new because there haven't been any solutions to the previous folks who reported a similar situation.
I discovered the problem when I was trying to render a video file to a quicktime .mov format and the quicktime codec was missing. My substitute for that was H264 which was fine but nothing like having quicktime.
Second time this quicktime plugin was having problems was when I goto the apple website to check out trailers and the plugin crashes without even trying to load the video.
I have Mac OSX Mountain Lion 10.8.3 the latest version.
Thanks in advanced all!
MacBook Pro (15-inch, Mid 2012), OS X Mountain Lion (10.8.3)