I recently updated from 2019a to 2020b. I've been working on Live Script. In 2019a, it works fine. In 2020b I'm seeing a serious problem. I open the script in the editor and run a section. Works fine. I look at the output. I click on Run Section again. The little wheel in the upper left starts spinning. But the Stop box in the Run area on the ribbon is greyed out. And I don't the "Busy" indication in the lower left of the Matlab window. ctrl-c doesn't do anything. It just sits there and churns until I kill Matlab and restart, and then it happens again. This situation is untenable.
Anyone else experience the same problem? And have a solution?