Civizualize does not render
It's probably a javascript error.

Most likely it's that you didn't properly configure the extension url for your extension. What configuration do you have? 

Checkout your browser console, do you have any error message? something about d3 missing?

You can also look at your Developer Tools (press F12 in Firefox/Chrome), and check the "Network" tab.  Are you seeing 404 errors?  Look at the URL that's getting a 404 error.  Is there actually a file in that location?  It's very possible that your "Extensions URL" is incorrect.  Go to Administer menu > System Settings > Resource URLs and change the Extension Resource URL to match the actual location of your extensions.