SOLUTION:
– Slider:
change theme
– Featured Image:
Read:http://www.wpbeginner.com/beginners-guide/how-to-add-featured-image-or-post-thumbnails-in-wordpress/
In the Header php: add <?php the_post_thumbnail(); ?> at the following space:
<!– #header –>
<?php the_post_thumbnail(); ?>
<?php /* Add responsive header menu */ thinkup_input_responsivehtml2(); ?>
Since today also the Slider is not working properly anymore. See: http://artesanianazari.es/
Even before todays Update the Slider Images looked like that, but I didn’t change anything!!! So I dont know why now the Slider Images are just displayed in this mini format (original picture Size is 1500 pixel x 500 pixel).
I made the Update, but it didn’t help. So it got even worse…Please help 🙂