Hello, thanks for the feedback,
I currently use version 4.7.4 of WP and the most current version of Pie Register.
I use the Malabar Theme.
When I try to insert a featured image I’m redirected to this page:
…/wp-admin/media-upload.php?post_id=2554&type=image&TB_iframe=1
I already delete other plugins to see if it solves my problem but only when I delete the pie register that the problem is solved.
I do not know much that I can pass on more information for you to help.