There appear to be at least two problems with the Melvin template when it comes to using Intro text and displaying the Read More button in category view of a blog layout.
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In a category blog of Joomla Articles (all created in the default article system), the Read More button does not display even when enabled in Article Manager properties.
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If you create a Joomla Article using SP Page Builder as the editor and add a Read More link within some text, nothing is displayed in the category blog except the title. Only when you view the whole article is the text and everything else displayed.