Web viewer with custom URL no longer downloads the file. The URL being used is for downloading an XML file. Credentials are required so I cannot share that info, however we have other machines that have NOT updated to the latest version of El Capitan that are working. This machine was out of the box, updated and installed on the same day and it does not download the file after the credentials are entered. Attempting the same via the browser was successful.
How to replicate
Buy a brand new iMac with El Capitan, update everything using the App store. Install FileMaker 14 and update to version 14.0.5. Place a web viewer on a layout with a custom URL that requires credentials to download a resource.