Solved: PDF flattening dialogue when printing PDFs that ar.
https://community.adobe.com/t5/acrobat-reader-discussions/pdf-flattening-dialogue-when-printing-pdfs-that-are-coverted-from-powerpoints/m-p/4065622
WebApr 13, 2012 · After clicking Print from the print dialog, a progress dialog appears and the status says "Flattening:" with a percentage. The progress moves very quickly to 44% (less than one second to get that far) and then basically stalls. It creeps along for the next 35 …
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