I have installed Alfresco 1.4 preview.
Sometimes i modified the text file , when i clicked the "Cancle" or "Finish" button there was no action on the screen.
I found this error on the tomcat console :
"
[org.alfresco.web.app.AlfrescoNavigationHandler] Attempting to close a dialog with an empty view stack, returning null outcome.
"
Thank you.