Problem with equal height of columns in Display Suite
Create your own layout for display suite and use CSS.

Add the folder 'ds_layouts' to you theme folder root.
Under that folder ad another folder: two_col_fluid_stacked_fixed_height

Ie Must look like this: YOURTHEMEFOLDER -> ds_layouts -> two_col_fluid_stacked_fixed_height

Add the following files to two_col_fluid_stacked_fixed_height folder:

two_col_fluid_stacked_fixed_height.inc

&lt;?php
function ds_two_col_fluid_stacked_fixed_height() {
    return array(
        'label' =&gt; t('two col stacked fluid fixed height'),
        'regions' =&gt; array(
            'header' =&gt; t('Header'),
            'left' =&gt; t('Left'),
            'right' =&gt; t('Right'),
            'footer' =&gt; t('Footer'),
        ),
        'css' =&gt; TRUE,
    );
}


two-col-fluid-stacked-fixed-height.tpl.php

&lt;&lt;?php print $layout_wrapper; print $layout_attributes; ?&gt; class="&lt;?php print $classes;?&gt; ds-2col-stacked-fluid-fixed-height clearfix"&gt;
  &lt;!-- Needed to activate contextual links --&gt;
  &lt;?php if (isset($title_suffix['contextual_links'])): ?&gt;
    &lt;?php print render($title_suffix['contextual_links']); ?&gt;
  &lt;?php endif; ?&gt;

    &lt;&lt;?php print $header_wrapper; ?&gt; class="group-header&lt;?php print $header_classes; ?&gt;"&gt;
      &lt;?php print $header; ?&gt;
    &lt;/&lt;?php print $header_wrapper; ?&gt;&gt;

    &lt;div class="center-wrapper"&gt;

    &lt;&lt;?php print $left_wrapper; ?&gt; class="group-left&lt;?php print $left_classes; ?&gt;"&gt;
      &lt;?php print $left; ?&gt;
    &lt;/&lt;?php print $left_wrapper; ?&gt;&gt;

    &lt;&lt;?php print $right_wrapper; ?&gt; class="group-right&lt;?php print $right_classes; ?&gt;"&gt;
      &lt;?php print $right; ?&gt;
    &lt;/&lt;?php print $right_wrapper; ?&gt;&gt;
    &lt;/div&gt;

    &lt;&lt;?php print $footer_wrapper; ?&gt; class="group-footer&lt;?php print $footer_classes; ?&gt;"&gt;
      &lt;?php print $footer; ?&gt;
    &lt;/&lt;?php print $footer_wrapper; ?&gt;&gt;

&lt;/&lt;?php print $layout_wrapper ?&gt;&gt;

&lt;!-- Needed to activate display suite support on forms --&gt;
&lt;?php if (!empty($drupal_render_children)): ?&gt;
  &lt;?php print $drupal_render_children ?&gt;
&lt;?php endif; ?&gt;


two_col_fluid_stacked_fixed_height.css

.ds-2col-stacked-fluid-fixed-height &gt; .group-header {
}

.ds-2col-stacked-fluid-fixed-height .center-wrapper &gt; .group-left {
    float: left; /* LTR */
    width: 50%;
}

.ds-2col-stacked-fluid-fixed-height .center-wrapper &gt; .group-right {
    width: 50%;
    height:99999px;
    position:absolute;
    right:0;
}

.ds-2col-stacked-fluid-fixed-height .center-wrapper {
    overflow:hidden;
    position:relative;
}

.ds-2col-stacked-fluid-fixed-height.group-one-column &gt; .group-left,
.ds-2col-stacked-fluid-fixed-height.group-one-column &gt; .group-right {
    width: 100%;
    float: none;
}

.ds-2col-stacked-fluid-fixed-height &gt; .group-footer {
    clear: both;
}

/*delete this*/
.group-left {
    background:yellow;
}
.group-right {
    background:red;
}


Clear you cache and use this layout in display suite. Tweak CSS to your liking.