Reply To: Black box appears in the search background

Of course!

Open up this file from your ftp program or from inside the plugin editor of wordpress: wp-content/plugins/download-manager/css/front.css

Make a new line at the beginning of that file and add the following lines:

.probox .proinput .loading {
  padding:0 !important;
  position: static !important;
}

Save the file and refresh your page. It should be ok after this editing.