From the SMP Console; viewed any Portal which includes a webview, all portals are displayed as blank white areas.
From the SMP Server Browser; opened the "About Internet Explorer" and found the Update Version line (KB3154070) is displayed.
Confirmed KB3154070 update has known drawbacks related to iframe loading by Internet Explorer.
To clarify: Upon attempting to open the portal URL manually it displays correctly; iframes fail to load contents silently.
Work through one of the following remedial steps: