I have noticed this a few times, Ill click on a commit with the durable column open and the file contents for all the files is in the "Loading" state, when I inspect the console I see the following js errors:
```
core.pkg.js:188 Uncaught Error: JX.initBehavior(map): behavior(s) not registered: differential-toggle-files, differential-dropdown-menus, differential-populate, differential-comment-jump, differential-edit-inline-comments, differential-keyboard-navigation, differential-add-reviewers-and-ccs, differential-feedback-preview, aphront-drag-and-drop-textarea
core.pkg.js:214 Uncaught Error: JX.$('transaction-preview') call matched no nodes.
```