Exclude Buttonizer from W3 Total Cache
In the admin dashboard menu, go to the menu item Performance and choose Minify ( Only on the admin sidebar menu ). Scroll down to the textarea 'Never minify the following JS files'.
When you use the Buttonizer free version, add the following rule:
When you use the Buttonizer premium version, add the following two rules:
Now you're finished. Save and purge the cache.