Affects Version/s: 7.0.X, 7.1.X, Master
Component/s: Collaboration > Item selector
Steps to reproduce:
1. Add the following lines to your hosts file:
2. Go to Control Panel/Virtual Instances, and edit the default instance's virtual host to myinstance.com.
3. Create a new blank site, and set mysite.com as virtual host for its public pages.
4. Add a public page to the site and put a Message Boards portlet on it.
5. Access mysite.com:8080 from another tab in your browser.
6. Click on "Post New Thread", then click on the Image icon in the Body section.
Checkpoint: The Select File popup is opened and rendered.
7. Close the popup and cancel the thread post,
8. Go to the Configuration of the Message Board portlet and change the scope to the page. Save.
9. Click on "Post New Thread", then click on the Image icon in the Body section.
Result: The popup loads indefinitely, it is not rendered.