The problem is often caused by a problem with Flash, which means:

• Your machine has a bad or incomplete Flash install, or
• Your security settings are blocking flash content

The “circle back to the logon page” can also happen if your security settings are blocking session cookies. 

To resolve this, you can:

The GTD course is designed to work at a minimum screen resolution of 1024x768. At your screen resolution, sections of the course window will not show up on the screen.  The solution is to increase your screen resolution to at least 1024x768.