ET Portflio Plugin Category Problem

Hi,
I encountered a serious problem regarding the plug ET -Portfolio.

1)When you create a new page using the template of the portfolio (Portfolio Two Columns, Portfolio three Columns, Masonry Portfolio) dynamic selection of categories created is not working.
If I select a single category (for which were included the portfolio item) I do not see nothing. How can I solve this serious problem?

2)Also if you change the default name of the elements (portfolio_item slug, portfolio_category_slug and portfolio_tags_slug) of the portfolio using the settings page of the plugin (/wp-admin/options-general.php?page=et-portfolio-settings) to assign the custom name, pages of Portfolio I had previously created are no longer reachable and if you try to access this page, the site returns a 404 error.
How can I solve this problem?

3)You can also create a page with the template “Portfolio three Columns”, but that displays only a specific category (or subcategories) of porfolio?

Am I the only one who has encountered these problems?

I need urgent support.
Thanks

Andrea