When you copy and paste from DataGraph, the program has a pdf and bitmap in the clipboard. It’s up to the program where it is pasted which one it will accept.
Powerpoint on the Mac has no problem with pdf (vector graphics) so everything looks great, but older versions of Powerpoint on Windows does not accept the vector graphics as noted in this article.https://support.microsoft.com/en-us/office/insert-pdf-file-content-into-a-powerpoint-presentation-5e7719d5-508c-4c07-a3d4-68123c373a62
There can also be an issue with transparencies not working in pdf for some systems, so if your Range has a transparency, that could be why it is disappearing.
It would be interesting to know what version of PowerPoint on windows they were using, but, in any case, here is what we would recommend to solve the problem:
1 – Increase the resolution of the graphic in DataGraph by setting the size to something like 1200 by 675 pixels. You will probably also need to increase your font and scale the size for viewing, as shown here.
2 – When you copy, select ‘Copy bitmap (no transparency)’. That should ensure that you don’t have any problems with transparency.
Let us know if this solves this problem. Good luck!