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Karl Heinz  Kremer
Community Expert
Community Expert
January 14, 2022

This is usually a font problem, and oftentimes related to a bad PDF file. If you did a normal save and not a save as, there is a chance that you can recover the original file. It is not trivial, so don't work on the original file, make a copy of the file and then work on the copy: http://khkonsulting.com/2017/10/pdf-time-machine/