When using the Web Shipping Javascript SDK the Ship Rush initial screen displays fine. If you press the Settings button (lower left) the page with display refused to connect:
Name:  Capture2.PNG
Views: 63
Size:  3.7 KB

If you right mouse click and select a new tab then it will display.

This does not occur if you go to ShipRush directly (without the SDK). What has changed recently (the last two weeks) to cause this to stop working?

I have a couple of upset customers since ShipRush support is pointing fingers at my customization. I have no control over this behavior and my product hasn't changed since Jan. 2018.