Hi Kevin,
I’m having a similar issue. After using After Effects for several years, I’ve never had this problem. Thanks, Angie and Karel for the other tips. No luck though. I also tried turing off the OpenGL Preview in the Comp window per a forum response at Adobe.com.
Here’s a screenshot of what I’m experiencing.
Best,
Bryan

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Rendering Factory
Bryan Zilar
Motion Graphic Designer
Los Angeles, CA
bryan(at)renderingfactory(dot)com