Sometimes i found this error.

[sshgz]

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.

[gavinc]

This happens when you are in a dialog but there is no page in the view stack to return to. This obviously shouldn't happen. If you have the steps to reliably reproduce the warning please post them here.

It's also a possibility that the use of the Back button could cause this, do you remember using the Back button?