I have cleared cache and shut down and restarted chrome.
Logged in or not I get the same thing. The screen comes up and I get the WebGL notice and then all the sponsors around the top and right edge. I get the Gold Loading symbol, sometime it's a very fast partial bar and it will flash a couple of times. Other times I get a longer loading and the bar fills completely up. After either scenario, the build area goes black and stays that way.
I've even left it running while I typed this response and no joy.
Ad blocker is off for AR15.com as well as Flash control set to enable all flash on the site and Popup blocker turned off as well.
About the only thing I haven't done is disable my firewall and no offense, but that's not happening.
Still like the site.
Sad puppy is sad.