I noticed that whenever I export a pdf map from ArcMap that it is exported as pdf version '1.6 (Acrobat 7.x).
With my recent mapbooks I noticed that some of the raster images dont load in completely when panning through multiple pdfs while using the latest versions of Adobe Acrobat Reader/Pro.
It seems like this is an older version of acrobat (7.x?) so I had a theory that maybe that was what was perhaps causing the issue, my ArcMap seems to export at this version by default, is there anyway I can force it to export at a newer version?
I attached an image of the properties of one pdf I just exported from ArcMap.
FYI - I am using ArcMap 10.7