My NextGen gallery kept vanishing on my frontpage. It did not show as long as the page was set to front page, as soon as I picked another front pade, the images reappeared. Even when I changed the theme, the gallery disappeared.
I checked and rechecked the source code, but what I apparently missed was the gallery being wrapped in auto excerpt tags:
<!-- Begin :: Generated by Easy Custom Auto Excerpt --> <div class="ecae" style="text-align: center"> </div> <!-- End :: Generated by Easy Custom Auto Excerpt -->
ecae ate next gen.
In the main admin menu within WordPress, go to “Excerpt”, then pick the tab “Excerpt location” and set Front Page Excerpt to No. That’s it.