plugins - Plug-in Conflict: Art Direction and Super Cache in WordPress

I believe the only way to currently get around this is tot directly use Art Direction but replicate that functionality yourself.

There are a few pages that talk you through doing that:

• http://digwp.com/2010/02/custom-css-per-post/
• http://wordpress.org/support/topic/plugin-art-direction-conflict-with-wp-super-cache

Hope that helps!