Slider disappearing

@marco-cherin: I checked the same on our server and it is working fine. Go to Dashboard=> Appearance=> Customize=> Featured Post Slider=> Slider Options and make sure you’ve put correct Post ID in Featured Post Slider #.
Let me know further.

Regards,
Mahesh

@marco-cherin: It’s kinda strange. And working fine on ours. Have you tried with the customizer instead of Theme options. And please try with different Post IDs(just for testing purpose) and please make sure the Post has Featured Image set.
From when are you facing this problem. Let me know further.

Regards,
Mahesh

@marco-cherin: We checked you site, and its really strange how the image in the slider is not appearing. For testing, We used post title “Program” and it displayed fine no matter how many times We refresh the page. We checked it different browsers too, just to make sure. We’ve reverted the slider image back to the one you’ve put. Please try adding a new one and test if it works.
And the other issue you’ve mentioned.
* My header image does not link to the homepage
-> We’ve fixed this one

*In the responsive menu (mobile phone) I cannot see the flags of the two languages
-> Go to Dashboard=> Appearance=> Customize=> Theme Options=> Custom CSS box and add the following CSS:

.sb-options a[href="http://www.paleoantropologia.it/it/"] {
    background-image: url('data:image/png;base64,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');
    background-repeat: no-repeat;
    background-position: 1%;
}

.sb-options a[href="http://www.paleoantropologia.it/en/"] {
    background-image: url('data:image/png;base64,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');
    background-repeat: no-repeat;
    background-position: 1%;
}

Regards,
Mahesh

@marco-cherin: Sorry for the late reply. When I tried with the Program post, it worked everytime. Did it worked for you with that post? Please try reinstalling the theme. Let me know if the problem persist.

Regards,
Mahesh

@marco-cherin: For this, you’ll need to create a child theme. You can find more details on creating child theme HERE. Then in you child theme’s functions.php add the following codes:

if ( ! function_exists( 'catcheverest_polylang_invalidcache' ) ) :
/**
 * Template for Clearing Polylang Invalid Cache
 *
 */
function catcheverest_polylang_invalidcache() {
	delete_transient( 'catcheverest_post_sliders' );	
} // catcheverest_polylang_invalidcache
endif;
add_action( 'after_setup_theme', 'catcheverest_polylang_invalidcache' );

Regards,
Mahesh

@marco-cherin: Please add the following CSS for flag in mobile menus:

.sb-options li:nth-child(10) a {
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAALCAIAAAD5gJpuAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAE2SURBVHjaYmSYyMDwgwEE/jEw/GF4mvT0HyqQUlX9B5aEIIAAYmH4wlDtWg1SDwT//0lKSv7/D+T9/w+nYmL+//79/88fIPll0yaAAGJhYAGJP/n69O+/v0CAUAcHt2////ULqJpRVhZoA0AAsQCtAZoMVP0HiP7+RlcNBEDVYA0Mv38DNQAEEMj8vwx//wCt/AdC/zEBkgagYoAAYgF6FGj277+///wlpAEoz8AAEEAgDX/BZv/69wuoB48GRrCTAAKICajh9//fv/6CVP/++wu7BrDxQFf/YWAACCCwk0BKf0MQdg1/gBqAPv0L9ANAALEAY+33vz+S3JIgb/z5C45CBkZGRgY4UFICKQUjoJMAAoiRoZSB4RMojkHx/YPhbNVZoM3AOISQQPUK9vaQOIYAgAADAC5Wd4RRwnKfAAAAAElFTkSuQmCC');
    background-repeat: no-repeat;
    background-position: 1%;
}

.sb-options li:nth-child(11) a{
    background-image: url('data:image/png;base64,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');
    background-repeat: no-repeat;
    background-position: 1%;
}

Regards,
Mahesh