If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
This message appear when I upload a pdf to Media Library. It works fine but it is annoying and ugly!
Warning: imagecreatefromstring(): Empty string or invalid image in /Volumes/xxxxxxxxxxxxxxx/wp-includes/media.php on line 258 Warning: imagecreatefromstring(): Empty string or invalid image in /Volumes/xxxxxxxxxxxxxx/wp-includes/media.php on line 258 1176
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