You're welcome, glad I could help! Unfortunately I won't be at .conf this year, but I'll get back to your offer if we meet another year 🙂
CSS should not interfere with your js. If it works in the search app but not in another one, then I could imagine incorrect paths/filenames as the culprit. If the file system permissions are all right (which you pointed out above), then there is no reason for some js to work in search but not in another app - the only dependencies are those coordinated by requirejs. Oh, and you did restart splunk after creating the js file, right? That's also required.
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