I mentioned this in the uninstallation topic that you started, but this seems like a better place. There was a change to the WPS syntax on June 23 of this year. Themes that have not been updated since then will not display and Rockbox will default to the basic "rockbox_default" theme. Pay attention to the dates in the description. Of course, if you had searched for broken themes you would have found that this has been addressed repeatedly.