In trying to fix the bugs in 3.3.60, I replaced the page-builder.js in Dante/swift-framework/page-builder/assets/js according to the solution on this thread, because I was experiencing the same issues.
The issues I was experiencing were resolved with 3.3.61, but I haven’t been able to use the “add media” at all since. For example, open any page and scroll down to Meta Options and click “Add Media” next to “Fancy Heading Background Image.” This also effects the Swift Builder if you go to add media or an image within the page, it won’t pull up the media library. I have to open the media tab separately and copy and paste the URL directly. Thanks for your help.