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I found the solution! After reinstalling Parallels Tools, the issue persisted. Then I found an article on Parallels' support forum where there...
Interesting footnote: the distortion doesn't occur during the transition between slides but only after the transition ends. Also, I tried...
Context: MacBook Air, early 2015 edition, running Parallels with Windows 10. About a month ago, upgraded from Office 2010 to Office 2016, and the...