It depends on what's inside that MOV, Nigel.
Open the MOV in Media Info (a free download) and then post to this forum the resolution, frame rate and, above all the audio and video codecs that are listed.
Meantime, make sure you've got the latest version of Quicktime installed on your computer, per the program's requirements.
If your Premiere Elements 11 is on Windows 10 64 bit, you do not want to install QuickTIme 7.7.8 (latest version). Apple has a problem with 7.7.8 on Windows 10 64 bit. The recommendation is to use QuickTime 7.7.6 instead on that computer with Premiere Elements 11 and be running both as administrator (from user account with administrative privileges). Even though 7.7.6 is not the latest version of QuickTime 7 it does meet the Premiere Elements requirement for QuickTime 7. Please use the following link for the download and install....
Any questions or need clarification on the above, please do not hesitate to ask.
The integrity of the QuickTime install is prime importance when working with .mov files (QuickTime) and needs to be ruled in or out of the problem situation.
Thank you, A.T. Romano. I have done precisely what you helpfully recommended but when I open a .MOV file in the Quick Time the videos are still not running / screen is black. Have you any further thoughts pls?
Apologies for my rank amateurism.
Premiere Elements 11 on Windows 10 64 bit.....
Thanks for the reply.
About McAfee....take it seriously. MediaInfo is a great free troubleshooting program but it often comes with unwanted baggage. At extremes the unwanted baggage can bring down your browser and clutter your installed programs list. You need to be careful about your source of the download and the choices that you make during the download and install. I have used the following link for MediaInfo without consequences recently; consider if you want to see how McAfee responds to it.
Or, you may be able to get the information that was requested of you from the free codec utility named GSpot. Less hassle.
We will be watching for more details. Did you ever say if this issue is confined to just these .mov files or to all video file irregardless of the format?
Thanks for the follow up. Appreciated.