I successfully installed the "singledemo" code onto a website and it appears to work as intended. However, when I use similar code on a different site, everything appears normally, except when i hit the Red X button to remove a file from the queue, the "Cancelled" message does not appear. However, after a delay, the file is removed. Note that this is before I do any actual uploading.

How do I get the "Cancelled" message to appear as it does in the demo?