The reason it started working is because the plugin enqueues it’s scripts and as prerequesites are marked two WordPress internal resources, one is ‘jquery’ and the other is ‘wp-hooks’.
Any internal prerequesite scripts marked in enqueued scripts are automatically loaded by WordPress upon initialization. The issue in your case is, that something is very likely forecefully dequeueing or preventing the queue the ‘wp-hooks’ script handle, thus the prerequesites are not met, and wordpress simply ignores the scripts from loading.
I can (and probably will) make an adjustment in our plugin to try to load without the ‘wp-hooks’ enqueue in the future release, which could bypass the issue – but I still recommend investigating what the actual cause is for that missing resource. Unfortuantely I don’t know where to look for these, I very highly doubt it is a configuration related issue. Scripts are usually dequeued programmatically.