Quicktime won't play on Mac but will on windows. Help.

Hello. I'm trying to help a student who's taking an online class using Course Compass. She is on a Mac using 10.6 and I'm using 10.5. Neither of us can get the videos in the course to work. The Quicktime plug in is getting activated, but nothing plays. Strangely enough, the play just fine on Windows. Here is one of the videos: http://www.mathxl.com/Info/MediaMov.aspx?movurl=http%3a%2f%2fmedia.pearsoncmg.co m%2faw%2fawbittinger_prealgebra_5%2fvideo%2fbpa05_0304e05MSTR.mov
Thanks for any help!

I see a box that says "Show legacy codecs" but when I check it nothing happens.
Believe this setting is to enable named list access of the legacy codecs for encoding purposes -- not playback.
As far as I know, you should have playback access under Leopard without having to do anything more. However, this assumes that you are, in fact, receiving the data stream. BTW: this is an RTS (Real Time Streaming) file, so make sure your streaming/transport protocols are properly set.
As to Snow Leopard, I am still unsure if legacy access is handled solely by the dual 32-/34-bit structure embedded in the OS in conjunction with the QTkit or whether the QT 7.6.3 Player must also be installed. (Since I was a QT Pro user, this was all done automatically for me when I upgraded to Snow Leopard.) As to streaming the file to Snow Leopard, I was unable to get the file to stream at all with either QT X or QT v7.6.3. (I.e., it simply keeps "negotiating" with the server until it is finally timed out.) Since many users have complained of streaming problems on a hit or miss basis, I am, for the nuance, considering this to be a Snow Leopard issue.

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