If you are using a current version of Chrome there might be an issue with WebGL support.
Here are three quick things you can check:
- Go to chrome://settings/, scroll to the bottom and click Show advanced settings..., and make sure Use hardware acceleration when available in the System category is checked and turned on.
- Visit http://get.webgl.org/ to verify whether you have WebGL working, and if not it'll have a link to a support website.
- Recently, Chrome seems to have blacklisted some 3D graphics hardware that was previously approved. You can work around this by going to chrome://flags. Look for a setting called Override software rendering list and make sure it is enabled. (You'll need to restart Chrome after changing this setting.) After you've enabled it and restarted, the flag should look like this:
If none of that gets you going quickly, please let us know and we'll help you out.