What's up with J5 and gridbox cache?

What's going on with the cache in gridbox? I can't seem to disable it at all.
I have J5 cache disabled, I have page cache plug in disabled, but gridbox is still caching.
I literally deleted initmenu.js from the server and gridbox is still finding ways to load it.

New browser/new machine seems to be the only way to get past this.

What am I missing here?

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