From the Model Mayhem FAQ:

Why are some areas of the site not loading?
There are a few reasons why Model Mayhem might not be loading for you.

First, check your internet connection to ensure that it is stable. You will also want to check if there are any firewalls or VPNs on your system, as these are notorious for slowing or blocking parts of Model Mayhem.

Next, check if you have any ad or pop up blockers running. Since these things are intended to block whole elements of a site, it is possible that they are blocking legitimate parts of Model Mayhem in addition to the ads or pop ups you are trying to avoid.

Model Mayhem also uses some Flash and Java elements to run different areas of the site. These programs update regularly and some features on Model Mayhem will not work without the latest versions. If you are not using the Chrome browser (which updates these programs automatically), then it is possible that your Java and Flash players are out of date. Try updating your Java and Flash and see if it helps the issue!