[4.11P2 Prebuilt][Bug] HTML5 map downloading on the fly is broken. (Plus problems with non-map downloading on the fly on latest firefox)

Development Platform & Builds
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Resolved the SlateApplication.cpp error. Turns out it was a problem with having a PS4 controller plugged into my computer’s USB and using the DS4Windows application. Unplugging it has made that error go away.