Just FYI, your index page does not use power gallery, this is using the All in One Banner rotator JQuery script.
i found the help documentation for it here:
http://www.sanders.uk.com/bannerRotator/____help.html#js_options
in the js options section. it mentions a autoHideNavArrows option.
i edited the script on the index page to add that option set to false:
<script type="text/javascript">
jQuery(function() {
jQuery('#allinone_bannerRotator_universal').allinone_bannerRotator({
skin: 'universal',
width: 960,
height: 450,
responsive:true,
thumbsWrapperMarginBottom:-35,
autoHideBottomNav:false,
showPreviewThumbs:false,
defaultEffect:'fade',
showCircleTimer:false,
responsiveRelativeToBrowser:false,
autoPlay:8,
autoHideNavArrows:false
});
});
</script>
to force the nav arrows to always show.