HT1338 Quicktime Player no longer plays under Mountain Lion

Quicktime Player no longer plays under Mountain Lion.  It loads, I can see the video but it does not move when clicked on to advance. It does move page by page mannually with the arrow buttons but does not play when clicked on the video advance button.

Is this a known problem?
Yes, if you mean that the MOV file may contain data that is not supported by the QT X AV Foundation, Modernizer, and Convert 64-bit QT X structures embedded in the Mavericks and Yosemite operating systems but still supported by the 32-bit QT 7 structure still included in these operating systems and/or supported by the "open" codec configuration accessible by QT 7.
Has the format of mov files been changed?
I don't believe the file container format has changed but security updates and/or Mavericks/Yosemite codec support limitations may fail to recognize or support a particular file container/data compression format combination. Since you have not provided any information regarding the data actually contained in the MOV file, it is impossible to be more specific here. However, in most cases it is possible to use any of the available FFmpegX based transcoding utilities to manually convert unsupported data to file/compression combinations that are compatible with both QT X and QT 7 based apps under any current Mac OS X systems.

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