Quicktime not playing .mov files

i have a problem with quicktime. it doesn't play .mov files. if i try to play .mov files that are embedded in a .pdf file, a window opens but stays blank, although the progress bar moves. if i try to open the files in quicktime, there's no window, just the progress bar that moves. i run the latest version. i've already tried reinstalling - didn't help, uninstalling completely and installing - didn't help.
help?
many thanks!
diana

Quicktime>Quicktime Player Preferences>Advanced
Click on the MIME Settings button.
In the next window that opens up make sure that Streaming-Streaming movies is enabled (checked).
While you’re at it make sure all the boxes are enabled by clicking on the corresponding triangles so that they are pointed down.
This will show the “hidden” boxes especially the *QuickTime Movie* box. This box will enable you to play .mov files.
Click the OK button.

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Quicktime not playing .mov files

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