I'm having an issue with Woocommerce variable type products when using W3TC. If I have W3TC enabled, when selecting the product option in the product page, the "Add to Cart" button doesn't appear. I have been able to track this down to be an issue with W3TC JS Minify, i.e. if I disable JS Minify in W3TC settings (Performance => Minify => JS minify settings => uncheck "Enable"), the buy button appears fine.
I posted this question to W3TC forums couple of weeks ago, but haven't got any answers, so maybe this is better suited to Woocommerce support forum. This isn't a theme issue either, as I have tried both my custom theme (PixelPress) and the default "Twenty Eleven" theme, and both have the same problem.
Anyone has any idea how to fix this?