First, add the following shortcode into the post or page and preview it:
[tag_groups_cloud hide_empty=0 delay=0]
- Open the Console in your browser, reload the page and check for error messages that give a hint about where the error was caused.
- Disable other plugins and check, it the tag cloud now renders correctly. If yes, enable the plugins again one-by-one and keep reloading the page in order to find out where it breaks.