1.) The Default skin does not have any themes. The DefaultWide skin does have themes. I assume that both skins should be the same. In fact, it should be possible to make Default a theme of DefaultWide.

2.) The "theme" section of SkinSettings.xml should only contains one "name" entry; the name of the currently selected theme. Having more than one entry could result in unpredictable behavior since the settings are read into a dictionary in an unpredictable order. In any event, having more than one entry is not supported. FYI - The list of names of available themes is determined by reading the content of the "theme.xml" file in each subdirectory of the skin Themes directory.

Following is the current content of DefaultWide SkinSettings.xml:

<profile>
  <section name="booleansettings">
    <entry name="#skin.tvguide.usecolorsforbuttons">True</entry>
    <entry name="#skin.tvguide.usecolorsforgenre">True</entry>
    <entry name="#skin.tvguide.useborderhighlight">False</entry>
    <entry name="#skin.tvguide.showgenrekey">True</entry>
  </section>
  <section name="theme">
    <entry name="name">Skin default</entry>
    <entry name="name">No Animation on BasicHome</entry>
  </section>
  <section name="tvguidecolors">
    <entry name="guidecolorchannelbutton">FF404040</entry>
    <entry name="guidecolorchannelbuttonselected">FF6495ED</entry>
    <entry name="guidecolorgroupbutton">FF404040</entry>
    <entry name="guidecolorgroupbuttonselected">FF6495ED</entry>
    <entry name="guidecolorprogramselected">FF6495ED</entry>
    <entry name="guidecolorprogramended">FF202020</entry>
    <entry name="guidecolorborderhighlight">FF6DF0FF</entry>
    <entry name="defaultgenre">FF83A17D,FF404040</entry>
    <entry name="0">FF18D22E,FF18D22E</entry>
    <entry name="1">FFFF69B4,FFFF69B4</entry>
    <entry name="2">FFFA1919,FFFA1919</entry>
    <entry name="3">FF800000,FF800000</entry>
    <entry name="4">FF2169EE,FF2169EE</entry>
    <entry name="5">FFFFD700,FFFFD700</entry>
    <entry name="6">FF006400,FF006400</entry>
  </section>
</profile>

3.) The DefaultWide theme "No animation on BasicHome" contains a file named themes.xml (with an 's'). This file is not needed and can be deleted.