I updated our website to WordPress 3.9 and have been unable to drag images in the gallery layout. The thumbnails appear to be locked. Additionally, when I update posts and assign them to several galleries I don’t see them in the galleries.
The best solution, is to update the Plugin, login to CodeCanyon, head over to your Downloads section and re-download the plugin like you did when you bought it.
Extract the zip’s contents, look for the extracted plugin folder, and after you have all the new files upload them using FTP to the /wp-content/plugins/dopwgg/ folder overwriting the old ones (this is why it’s important to backup any changes you’ve made to the plugin files).