diff -r 2973198ae2a9 -r 109da596fa9d plugins/org.symbian.tools.tmw.previewer/src/org/symbian/tools/tmw/previewer/preview/AbstractPreviewPage.java
--- a/plugins/org.symbian.tools.tmw.previewer/src/org/symbian/tools/tmw/previewer/preview/AbstractPreviewPage.java	Wed Sep 01 16:59:08 2010 -0700
+++ b/plugins/org.symbian.tools.tmw.previewer/src/org/symbian/tools/tmw/previewer/preview/AbstractPreviewPage.java	Thu Sep 02 10:50:38 2010 -0700
@@ -48,7 +48,7 @@
         this.previewView = previewView;
     }
 
-    protected void toggleRefresh() {
+    protected synchronized void toggleRefresh() {
         toggleState = !toggleState;
         toggleRefresh.setChecked(toggleState);
         previewView.setProjectAutorefresh(project, toggleState);