Javascript rendering error SSRS 2012 Report Viewer control

  • We're seeing an issue where a report is rendering correctly in IE11 when viewed via directly ReportViewer.aspx but when viewed via the SSRS Report Viewer control is giving a javascript error.

    The report appears to start processing correctly but just fails to render properly after a minute or two.

    The error reads: "Unable to get property 'PRM_ServerError' of undefined or null reference"

    We've tried setting compatibility view, setting the meta edge tag and more besides. Another strange thing is the "Loading" doesn't rotate.

    Can anyone advise?

    Paul

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