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This is on Catalina while running Mathematica 12 (64-bit version which is technically supported on Catalina). I can open notebooks but they seem unresponsive to typing or scrolling. However, if I drag or resize the window then I can see the changes I made. I am unsure if the issue is with Mathematica or with Catalina. I wanted to post here in case anyone has faced similar issues / knows a solution. I will be contacting Wolfram tomorrow.

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  • $\begingroup$ Have you tried searching this site for "unresponsive" or something else that describes the situation? It may be a problem that has occurred on previous releases and/or system. $\endgroup$ – LouisB Oct 21 at 23:31
  • $\begingroup$ Thanks for the suggestion. I did find a solution that worked. Posting it below. $\endgroup$ – Quarky Quanta Oct 22 at 4:52
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Executing the following in the Terminal solves the issue:

defaults write com.wolfram.Mathematica NSRequiresAquaSystemAppearance -bool YES

More details here: Cannot install Mathematica 12 on macOS Mojave. Front-End completely unresponsive

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