If you're seeing this on multiple projects, then it seems like something's gone wrong with your PD installation or with your computer. The quickest way to check your PC is to run the 2 commands shown in bold in this
post.
If you're running PD365, make sure you have the latest version (20.4.2829). If not, get the latest version from the CL App Manager. If you're running PD20, make sure you install the latest patch (Build 2607) from this
page.
You may also need to update your video driver. Please see the Read Me Before Posting
guide to create the DxDiag file and attach it here if you need more assistance.