The following error is displayed in the ZCC when I trying to add an Icon
into a bundle using IE7:
"Error uploading file - null"

I've added my ZEN server's URL into the "Trusted Sites" security zone
(as well as moving it to the "Local Intranet" security zone) but that
doesn't appear to work.

I'm able to add the Icon using Firefox on the plugin has been installed.

Any ideas?