Widgets are not displaying, getting "400 Bad Request" error.

Good evening:

I was looking at using one of the following widgets instead of using multiple drop down boxes (I am unable to decide which one because of the error messages):

Visual MultiSelect

Orderable List

Dual List Box

Each of these generates the error message (either when previewing the form or when editing the form) 

'400 Bad Request

The plain HTTP request was sent to HTTPS port

nginx'

Any advice would be most helpful

With thanks

Michael

I am not able to replicate the issue. The widgets are displaying fine on your form.

This might be a temporary issue. Could you please check again and let us know?

 OK, I am at a loss as to what is happening. Everything is now working as it should - thanks for your help

cheers

Michael