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Upload control showing 100% but not rendering


I've installed the PKS solution in 2 environments, now on the prod environment we are getting an error with the upload control. All required entries are in the web configs to render the control; all the settings have been reviewed and appear to be correct. I've uninstalled and reinstalled but am still seeing this error message & the control, just spins to 100% and never loads. See attached screenshots. Any ideas?

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