Hi doodle*n*bug,
Thanks for letting us know about this. Based on the error you are receiving, it sounds like there is a browser issue or process on your end that is interfering with the loading of the image selection pop-up window. I'm sure there are a variety of other possible causes as well.
If you continue to experience this problem, I recommend contacting our customer support team using the web form on the following page of our site:
http://www.auctiva.com/help/requesthelp.aspx-Mike