Good morning,
Using the buidler to add a Javascript to a button. The builder 'hangs'. Upon further investigation - if you open the console in Chrome from the developer tools menu - you can see that there are errors in the code that is running the builder.
Image attached. This makes the builder TOTALLY UNUSABLE as of this morning.
Also of note - there are other odd items with the builder. If you edit a button - about 50% of the time - you cannot delete a button or an item in the builder that you would like to delete.
Not sure what change was made overnight - however, you might consider backing it out - until these items are fixed.
Happy Friday,
Bruce