This sounds like a problem with your video card drivers.  Maybe the drivers were updated recently?  You might need to go back to an older version.   At any rate see if this tech article helps: https://www.chiefarchitect.com/support/article/KB-00106/troubleshooting-3d-camera-view-display-problems-in-chief-architect.html   If not, then you might want to contact tech support during normal business hours.  
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