A couple of reasons are possible. If you are viewing on older versions of Internet Explorer (10 and below), or Google Chrome then you will need to upgrade your browser version.
But another thing that might occur is that some IT departments disable Javascript for machines on their networks, which will also stop the map from appearing or functioning on your desktop machines.
But don't worry - you can also view the map on your personal smart phones while you have a conversation with your IT support staff. If you can ask them nicely to whitelist our domain (tiscreport.org) for Javascript to run you'll be up and running in no time.
If you're still having issues please get in touch with a screen grab, your browser and operating system details, and we'll get to the bottom of it for you.