My first bet would be a mod_security issue- take a look at the discussion here: https://expressionengine.com/forums/topic/252252/problem-with-bluehost-and-mod_security
It’s pretty easy to tell. Go edit an entry with a file field on it. Open up your browser dev tools and take a look at the network traffic- refresh the page if you need to.
I’m betting you’re getting a 404 or 500 or something bad on a couple of combo_load pages pulling in javascript. If you go directly to the URL in question, you may even get a message saying something like ‘mod_security rejects all your stuff’.
That look likely?
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