For some people the skins selector is bugged. This has nothing to do with the skin, it is just a Planeshift Bug. To get around this, go to the planeshift directory, usually c:\\program files\\planeshift crystal blue, and locate the file named psclient.cfg
scroll down to near the bottom and find where it says:
Planeshift.Language = english
Video.OpenGL.UseExtension.GL_ARB_vertex_buffer_object = false
Video.OpenGL.StencilThreshold = 50
Planeshift.Client.Loading.AllMaps = false
Planeshift.GUI.Skin.Ingame = default
and change the word default to ragnarok - this should work as long as the ragnarok.zip file is in the skins directory.