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I'm pretty sure you should be investigating that "Unspecified error" that happens first.
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that's usually caused by a major error like mismatched braces in your code.
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Solved –
Our server was incorrectly blocking ".*map.*" instead of "\.map$" in an attempt to stop external people loading JS/CSS .map files. Once this had been updated, it fixed the problem.
Thanks for everyones help.