Maybe another plugin is conflicting.
Look on the Admin – Plugins – menu.
Temporarily Disable (not uninstall) all your other plugins.
Does it work now? If yes, Activate the plugins one by one to determine
which one conflicts. Which plugin was causing it?
Or your server does not fully support PHP making images.
PS your site is blocked my Malwarebytes’ Antimalware
This means your sites’ IP address is on a known list of infected web sites.
See here for more information:
http://forums.malwarebytes.org/index.php?showtopic=49345
Hi Mike,
I have experience on your visitors Map. There are servers that does not work with it peoperly, like my previous hosting server. Once you log on the the site, a 404 error page will pop out. However, I have change the hosting, it work fine and efficiently.
Thanks
YBR