Hi,
I finally managed to the get the authoring tool upgrade to work, but there seems to be one little problem with my upgraded courses--specifically the Enable accessibility setting in configuration settings.
If I go into the Config settings for a course and click save without even making any changes, the Preview stops working (the "Loading" icon spins forever, but no errors are logged in the console). If I go back and set "Enable accessibility" to false, it starts working again. Re-enable it and the preview fails again.
I don't see any other posts here or issues in github about, but maybe I missed something. Is this a bug or is accessibility not supported in courses that were initially created in 1.1 maybe?
{I noticed a new bug fix was pushed regarding the config settings, but upgrading to 1.4 didn't change anything}