Hi everyone,
Yes, I did change themes for one that supports bbPress.
That being said, I had found a partial solution. Download and install a theme with bbPress support (for example, the twenty twelve theme). Copy somewhere all the .php, .css and .js files related to bbPress. Then reinstall Customizr and put the .php files in the /wp-includes directory, the .css in the /wp-includes/css directory and the .js in the /wp-includes/.js directory.
The solution is not perfect. The layout will be somewhat affected, but at least it’ll work.
Hope that helps.