Panacea as I know doesn't use the direct "template_name"-custom.css file ( correct me if im wrong )
You would need to add your css the old way as far as i know
www.rockettheme.com/magazine/dec-2011/13...cket-theme-templates
PS I could be full of $%#^ .
Maybe try renaming your css file to rt_panacea-custom.css
instead of rt-panacea-custom.css
Remember to clear all caches
ismadman, youredaman!