Index: sections.module
===================================================================
--- sections.module	(revision 290)
+++ sections.module	(working copy)
@@ -174,7 +174,7 @@
   global $sections_section;
   
   // If node specific theme is configured, switch to that theme.
-  if (arg(0) == 'node' && is_numeric(arg(1)) && !arg(2)) {
+  if (arg(0) == 'node' && is_numeric(arg(1)) && ( !arg(2) || arg(2) == 'preview' || (arg(2) == 'revisions' && arg(4) == 'view') ) ) {
     $node = node_load(arg(1));  
     if (!empty($node->sections['theme'])) {
       _sections_switch_theme($node->sections['theme']);