Header from the insert Gliffy Diagram window is not rendering

When editing a page and going to "Insert" > "Gliffy Diagram" the header is not rendering. There should be found a link button called "Insert Diagram". The following screenshot shows how it should be displayed:

So when you click "Insert Diagram" you are able to insert an already created Gliffy Diagram:

The following screenshot shows how it is being displayed in Confluence OnDemand:

As a workaround for displaying an already created Gliffy Diagram you can either:

1. Go to "Insert" > "Gliffy Diagram"
2. Click "Search" on the left menu > search for the desired diagram
3. Click in create
   this will create a new image file based on that previous file.

or

1. "Insert" > "Image"
2. Select "Attached Images" from the left menu > Choose the file you'd like to use
   this will only display the image on the page, it won't be possible to edit it