I am a relative novice in PP though I have successfully edited and published a few videos for which people have actually paid. I am using PP 2021 updated on a Windows 10/64 w/Core firstname.lastname@example.org 16 gig ram and a stout video card.
This morning I am attempting to edit a short video and when I insert text and then play, the text is pixelated. When I stop the playback, the text returns to a normal appearance. I've inserted a lot of text in the few videos I have done - and have never before experienced this isssue.