The symptoms were:
Activating the NextGen Gallery plugin caused the homepage slider to disappear. The theme is Asteria. https://relpnc.org
I noticed an error in Firebug console:
$(“ul.main-navigation”).superfish({
TypeError: $ is not a function
Found a solution here:
https://stackoverflow.com/questions/12258282/typeerror-is-not-a-function-wordpress
Original code in footer.php
<!-- Initialize the Slider, Dropdown Menu and jQuery Tabs -->
<script type="text/javascript">
$(window).load(function() {
$('#slider').nivoSlider();
});
</script>
<script type="text/javascript">
$("ul.main-navigation").superfish({
animation: {height:'show'}, // slide-down effect without fade-in
delay: 1200 // 1.2 second delay on mouseout
});
</script>
Revised code in footer.php
<!-- Initialize the Slider, Dropdown Menu and jQuery Tabs -->
<script type="text/javascript">
jQuery(document).ready(function($) {
$(window).load(function() {
$('#slider').nivoSlider();
});
});
</script>
<script type="text/javascript">
jQuery(document).ready(function($) {
$("ul.main-navigation").superfish({
animation: {height:'show'}, // slide-down effect without fade-in
delay: 1200 // 1.2 second delay on mouseout
});
});
</script>
Your theme may be similar.