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ISSUE: The HTML page output that was generated "correctly" in v12.3 no longer works in v13. Specifically, the "Column" format of a simple List is now lost when the HTML page is generated. The following code worked beautifully in v12.3: ...
Fantastic!!!! Thank you very much Hans and Ian... using Ian's command: Evaluate CurrentValue[$FrontEnd, {RenderingOptions, "PreferredGPU"}] = "Software" and restarting the app. did the trick. Huge thank you!