A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
I have a similar issue to the one reported here. Sometimes my powerpoint 2016 file becomes "corrupted" and I am unable to save, it looks like it saved but it doesnt. When I try to click save again, the file turns to Read-Only and warns me that I cant save because it is a ReadOnly file. Even if I try saving with another name, to another location (local or network regardless) it doesnt let me.
I found out the the problem is precisely with a chart I have in a certain slide. Even though I dont have any link to any external excel file. But whenever I use the charts option to FILTER the chart series (ie to show only some points in the chart) the file is unable to be saved. If i remove the filter then it allows me to save the file. This is a bug and needs to be corrected.