I was using this plugin on a Genesis child theme site.
I then added the WPML plugin and created a translation for an AgentPress listing CPT.
The original listing has images attached. The translation doesn’t show attached images at forsit which should be the normal behaviour I suppose. But then if I opn the Media uploader, images appear in the Gallery Images metabox. Then when I close the media uploader, a popup appears and says “this page has caused an error”.
This is happening on a local dev installation.
I don’t know if the issue is caused by WPML or this plugin though.
I recorded a short screencast to demonstrate when the plugin is activated, thepopup is displayed, when the plugin is not activated, I can insert a gallery with no error message. http://screenr.com/hfM8
The issue might be related to the AJAX recently added so the gallery updates when you make changes in the media uploader. I’m no jQuery expert so can’t really test and see what’s specifically wrong, but it would tell me that the jQuery aspect needs to be reviewed by someone else.