There is a problem using the customtag functionality.
Steps to reproduce:
Create a new customtag that has "link" attribute. (or as a test/debug: edit ezdemo/settings/ezoe_attributes.ini.append.php and add Type=link to CustomAttribute_video_source then use the video custom tag)
Click on the folder to browse for the object to link to.
Select a node clicking the radio button.
ERROR: you get a blank screen.