Issue is that we have a problem with the template not displaying properly when we engage a caching plugin. Have tried a couple plugins with the same issue - that website does not display properly especially when a 'minimize css' function is engaged.
I have also been speaking with the developer for 'Viper Cache' and they gave this response below:
most Wordpress themes have a stylesheet file called style.css. This contains the styling for the theme. The theme you have installed does not have this. It actually loads the style via some Ajax request to Wordpress, which is unusual. The way the theme works would mean VC is not able to cache It or minimize it as you have seen. So leaving this option off is the only way to work with this theme.