Index: /CKEditor/trunk/_source/plugins/styles/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/styles/plugin.js	(revision 3208)
+++ /CKEditor/trunk/_source/plugins/styles/plugin.js	(revision 3209)
@@ -281,4 +281,21 @@
 		var lastNode = range.endContainer.getChild( range.endOffset ) || ( range.endOffset ? range.endContainer.getNextSourceNode() : range.endContainer );
 
+		if ( lastNode.equals( firstNode ) )
+		{
+			// If the last node is the same as the the first one, we must move
+			// it to the next one, otherwise the first one will not be
+			// processed.
+			lastNode = lastNode.getNextSourceNode( true );
+
+			// It may happen that there are no more nodes after it (the end of
+			// the document), so we must add something there to make our code
+			// simpler.
+			if ( !lastNode )
+			{
+				lastNode = document.createText( '' );
+				lastNode.insertAfter( firstNode );
+			}
+		}
+
 		var currentNode = firstNode;