There is a known bug that when you change your theme to rvskin you will have a lot of trouble changing back as there is no GUI option to change back.
matrafox.info/change-cpanel-theme-from-rvskin-to-x3.html
A few months ago I get a cpanel on another hosting company. I want to see how it looks rvskin themes, so I switch to it. After that surprise, I can’t check my awstats traffic, so my first idea is to switch back, however this was impossible ...
myliteraturetechlife.com/how-to-change-cpanel-theme-from-rvs...
How to change cpanel theme from rvskin to x3