Index: simplenews.module
===================================================================
RCS file: /cvs/drupal/contributions/modules/simplenews/simplenews.module,v
retrieving revision 1.215
diff -u -r1.215 simplenews.module
--- simplenews.module	30 Sep 2009 14:10:20 -0000	1.215
+++ simplenews.module	14 Oct 2009 04:48:40 -0000
@@ -1553,6 +1553,16 @@
       // Check if this node-language pair has been buffered.
       // If not, build the message and store it for later use.
       if (!isset($messages[$nid][$langcode])) {
+      	// Temporarily set admin theme to NULL.
+      	// This is done to prevent a problem where sites with an
+      	// Administration Theme set to a theme other than the default theme
+      	// fail to recognize default theme template over-ride files, for 
+      	// example, simplenews-newsletter-body.tpl placed in the default theme directory
+      	// is ignored in favor of the stock simplenews-newsletter-body.tpl.  
+      	global $custom_theme;
+        $save_theme = $custom_theme;
+        $custom_theme = NULL;
+     	
         $node = drupal_clone($context['node']);
 
         // Add simplenews specific header data
@@ -1599,6 +1609,8 @@
         $footer = theme(array('simplenews_newsletter_footer__'. $context['node']->simplenews['tid'], 'simplenews_newsletter_footer'), $context['node'], $key, $message['language']);
         $messages[$nid][$langcode]['footer'] = $footer;
 
+        // Restore previously set Administration Theme (see comment above)
+        $custom_theme = $save_theme;
       }
       else {
         // Get message data from buffer