Dear demoman2k10,
Since you are not answering I’m going to list the 6 possible reasons for 3d cloud not appearing:
1. Before installation of a new plugin version you have used an old one.
If so, open your old plugin instance and save it again without any changes or delete it and create new one.
2. You have created a cloud without content.
That means you have chosen, let say, Links as type of content, without having any external link; or Post Tags without any tag in your posts; etc.
3. You use an old or not standard WP Theme.
You can check this by switching to Twenty Fourteen WP Theme.
4. There is incompatibility between two or more plugins that you use.
Switch off all of them, except 3D WP Tag Cloud. Then start switching on one by one and check if 3d cloud still appears until you find the problematic plugin.
5. You use WP version lower than 3.9.
Update it.
6. The PHP version of your host is too old.
Ask your provider for newer, at least 5.2.17.
PS
I mark this topic as resolved.