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Hello, your problem is different and the problem is the cache: you should resolve by clean the cache of your browser. If you have CloudFlare active, you should also delete the cloudFlare cache.
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No, ti consiglierei di lasciare tutto come è: i blog AlterVista sono già configurati per essere scuri. Eventuali modifiche appesantiscono solamente il blog senza portare effettive migliorie.
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You must use a randomly generated number from your app: (I don't know the language you are using)

url = "name.altervista.org/folders/file.jpg?r="+random();

Bye!

Now, http://thunderbeeinteractive.altervista.org/Testing/Exodus_About.js returns 404.

So, i suggest to adding a random paramter like...

Are you sure the file has been deleted?
Can you show a screenshot of the contents of the files in the "Exodus" folder?

Bye!

Can you try to empty your CloudFlare cache? (Settings->cloudFlare)
Check Altervista Cache too (Settings->Altervista Cache).

If the problem persists, please provide the URL of the file.

Bye!

Did you try cleaning your browser cache?

Bye!