The html on the page that works is:
<div class="gallery">
<ul id="sigcd977a83da" class="sig-container">
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-block">
</li>
<li class="sig-clr"> </li>
</ul>
</div>
On the page that doesn't work it is (there should be 3 photos from a folder {gallery}forum/listen{/gallery}:
<div>
<ul id="sig779962d622" class="sig-container">
<li class="sig-clr"> </li>
</ul>
</div>
<p>Photographs are attributed to Georgie Scott/Age Concern.</p>
PS I have just copied the article down to my local server and it works! Cache is enables and I have purged the cache in config. Cache folder in Joomla! is 777. Any clues why not on the remote host appreciated.