When there are no threads or conversations the options handle is displayed, and clicking it displays the sort order. Although not a bug, the handle should be displayed only if there is something that can be sorted.
To fix this in thread view I wrapped the h3 and the form with: <xen:if is="{$stickyThreads} OR {$threads}">
and in conversation list: <xen:if is="{$conversations}">
To fix this in thread view I wrapped the h3 and the form with: <xen:if is="{$stickyThreads} OR {$threads}">
and in conversation list: <xen:if is="{$conversations}">