Applies to: MAC/Windows
Background: When a pdf the attached back cover, a white vertical line appears down the center. Even after restarting Quark Xpress 2018, pasting it into another document and pdf using different output settings. Moreover, document doesn't have any effects, drop shadows etc. included, it only consists of images, text and shapes.
1) Launch QuarkXPress 2018.
2) Open the problematic file.
Note: Please note that there will be no depreciation in Pdf output quality using the "Flatten Transparency" option.