/Simple and /Default are the templates. Icons and Buttons are image directories, or at least they should be.
My suggestion, would be to make a duplicate of one of the default themes on your computer, then edit it and upload it, but with all the same names. It's the easiest in my opinion and if something goes wrong you can just upload the default without having to worry about links and such.
As for the default one your using, it's an old one and may no longer be supported, I'm not sure. If you know how, edit the CSS and such to get the template you want. The whole theme structure needs to be looked at, and we may do something about it for the next release... >.>
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