Basically as it says in the title. I noticed two days ago and during the weekend I had created a pptx file with no problem. However, I got a presentation from a colleague which I had to edit and it doesn’t save the changes. I can always save in .odp but that’s less than ideal for sharing. Saving as with a new name gives exactly the same result. In any case, the modifications I’m trying to make are changing text and editing an image, nothing out of the ordinary.
Thanks in advance!
An anonymized sample file could effect wonders in examining it… 
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