Image alignment not working

Hello support forum.

Image alignment just stopped working.

WP and plugins: using latest versions.

The issue comes up in any theme; so, it´s not the theme, and the image aligment was working with the theme a month ago.

You can see the image aligned in the backend editor HERE

But when you go to the front end HERE you will see the image shows to the left, and the text does not wrap the image.

I have added the code below to the css:

img.aligncenter, div.aligncenter {
display: block !important;
margin-left: auto !important;
margin-right: auto !important;
}
img.alignleft {
float: left !important;
}
img.alignright {
float: right !important;
}

In order to see if it fixes the problem, as recommended by some posts in this site; but still not working.

In 10 years developing inside WordPress, I have never seen anything like this.

I am starting to think is might be a WP 4.3 version bug, as I updated recently. Anyone with the same problem in WP version 4.3?

Please help on this.

Thanks