I want to quickly address the two issues that originally started this thread for anyone that may find this.
When I save the widget automatically cleans the category field.
This is fixed with the version 1.0.3 update.
And the page only shows the title of the widget.
If you load the page and you see nothing in the widget, there are two scenarios I can think of that it would be.
1. You only have post. The slider plugin FlexSlider will not run if it only has one slide. A slider can’t be a slider without more than one thing to slide between, right? The news scroller is set to be hidden with CSS when the page loads and will fade in once everything is ready for a cleaner look. However, with only one slide (i.e. one post in this case) the slider plugin never loads, and never fires the code to fade in the slider.
2. Javascript conflicts or errors. Also, as I said in #1, the slider is hidden with CSS when the page loads, and it needs the slider to successfully load before it can fade it in with the javascript. So, if you have any javascript errors or conflicts on your page, this could cause this to happen. So, in this case, run through any plugins you have installed that might be outputting javascript on the frontend of your site.