The SVN folder structure (i.e. branches/, tags) isn't shown in the drop down box when the folder name isn't all in lowercase (read, uncapitalized) when using the admin checkbox "Use Built-in Symbolic Rules".

Additionally - Even given the symbolic rules below the "trunk" button on the UI will not correctly map to the trunk folder – see attached image no_equivalent_trunk.png.

<trunk regex="(Trunk|trunk)(/|$) " name="trunk" logical=""/>
<branch regex="(Branches|branches)/([^/]+)" name="${2}" logical=""/>
<tag regex="(Tags|tags)/([^/]+)" name="${2}" logical=""/></symbolic>