Здравствуйте.
Этот скрипт нужен для асинхронной загрузки CSS файлов. Вот подробное описание его работы filamentgroup/loadCSS
Отключить его никак нельзя.
Hello.
This is woody's normal job. The point here is that Woocommerce most likely performs output also via the ob_start() function. This is why this error appears.
Are you using ob_start somewhere else?
Try inserting one of these shortcodes into a regular post. Does it work?
Hello.
To add a slider to a page, use the shortcode from the widget settings.
If you don't have these templates in the list, make sure that you have installed the premium addon and activated the license in the plugin settings
Do you want to display instagram posts on your site's pages? Then this is the correct plugin. Try using a different template in the widget settings. For Example Thumbnails
Hello.
This template takes up 100% of the width of the block in which it is located. To fix this, you need to edit the theme and place the widget area in a block of the desired size.
Hello.
You have everything right. Premium plugin is an addon for a free plugin and they must be installed together. In the second screenshot, I see that you have a section in the menu, it has Settings and a section with snippets
Hello.
If you are afraid to attach a log here, you can write to us in support.
Webcraftic other questions support | Webcraftic - plugins and wordpress themes
Hello.
This means that the new snippets are not activated or the display is not configured correctly. Send a screenshot of the page with the list of snippets and the settings page for one of the snippets
Hello.
The plugin only allows you to use the built-in code on your site's pages. Read the documentation for how to write code. For example here
jQuery.ajax() | jQuery API Documentation
AJAX in Plugins « WordPress Codex
If you have any questions about the plugin, I will be happy to answer them