Index: lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java
===================================================================
diff -u -ra669b55dbd8e20c40ca34295641eee137b61f22e -rabc97e23a8e15a2b946a0efde82a2f12e35e7834
--- lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision a669b55dbd8e20c40ca34295641eee137b61f22e)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision abc97e23a8e15a2b946a0efde82a2f12e35e7834)
@@ -898,8 +898,12 @@
     @Override
     public GateActivityDTO isNextGateActivityOpenByLessonId(int learnerId, long lessonId) {
 	LearnerProgress learnerProgress = getProgress(learnerId, lessonId);
+	if (learnerProgress.getLesson().getLearningDesign().getCopyTypeID() == LearningDesign.COPY_TYPE_PREVIEW) {
+	    // teacher can rush through preview lessons ignoring gates
+	    return null;
+	}
+	
 	Activity currentActivity = learnerProgress.getCurrentActivity();
-
 	Activity nextActivity = null;
 	Transition transition = currentActivity.getTransitionFrom();
 	if (transition != null) {