“Powerpoint found a problem with the content in … .pptx.
PowerPoint can attempt to repair the presentation.
If you trust the source of the presentation, click repair.”
This problem occurs for presentations which have been downloaded or taken from a USB or other unknown source. Just go to Trust Center and specify the folder you require as a trusted location.
This is a quick and easy fix to the problem.
If anyone has time to translate this video for the benefit of other languages then your contribution would be very much appreciated. Thanks!