When clicking the Insert Document button in the post editor, I was getting a blank screen in the modal. The browser console was showing that it was getting an error trying to retrieve /?media-library=1. My (single, not MS) install exists in /documents, so this doesn't work.
I changed the path so that it matches my install (line 160 in extras.php), and it works. It's only a temporary solution.
Is this plugin supposed to be used on sites installed at root?