Fix PDF export bug that generates a black lined box in the upper right hand corner of slides.
Post describing the issue can be found here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_powerpoint-mso_imobile-mso_365hp/exporting-a-powerpoint-presentation-as-pdf-on/5acc5265-c3e8-4c4d-971c-d3bc84aaab02?
For the love of all things holy effing fix this. It didn’t used to do this until some stupid update around September 2017
Sascha Goto commented
It does so in the upper LEFT corner