Same problem, wasted time on forums, none of the proposed fixes work. Elsewhere it seems people are having this issue across the entire office suit since Office 2013 - all worked fine in 2010.
I just wasted hours working on a document for work before I realized word at home had destroyed all of the images!!
In the Powerpoint forums there's a reference to a mythical fix (hotfix) for this issue - one of the ones you have to request to download.... goodness knows why it's not auto-deployed as part of normal patches. Anyway I can't find the actual hotifx. Very
frustrating!!! Thousands of people have been having this problem for nearly 2 years now and there still seems to be no solution.
Most of the files I'm having trouble with are vector graphics, so it's not simply the 'number of pixels' that's the problem.
And what's the deal with a 260 dpi limit?? Printers have been > 300 dpi for decades, and many high resolution screens are getting close too ... what are Microsoft thinking!? Fix it!!