Big Icons – not shown

Hi, thanks for the great themes. We have been using Aqua, and now will migrate on Terra.

I cannot get Big Icon Featured Text Section working after a default installation of the theme in the brand new test environment. Sample text:

[feat_text title="Responsive Design" icon="screen" href=""]Terra is a clean and modern design WordPress theme characteristic for its responsive design.[/feat_text]

is not showing anything – just a white space where icon and text should be. Please advise. Thank you!