Installed the Maximum template, and clicking 'Customizer' button gets 'Retrieving styles data failed!' The same result happens when the Admin Tools component has been disabled. I at first had customized the default style, and then later read to leave that alone and to only customize a copied style. This new copied style is the new default, but no matter which style I am looking at, the 'Customizer' button fails to load styles.

Please read this trouble shooting guide
yootheme.com/support/question/75099