Are You Sure? after sending emails

I am have something going on that I am not sure how to handle. In version 7.0.9 I did not have this problem, but with 7.1 B2 I am. After sending an email, when I try to leave to a different window I get the message “Are you sure you want to leave”. I am on a MAC and this is happening in FireFox as well as Safari. I have attached 2 pics of the message. Please if anyone has any ideas please let me know, it is driving me crazy. Thank you in advance for your time. 

i have seen this too

Prolaznik, are you using a MAC or PC?

 pc xp pro.

I have been doing some research on this and I am finding out that it is caused by the Java script not handling the event correctly. If the email was sent then the onbeforeunload should get set to null. But it looks like that is not the case and the onbeforeunload function is being triggered. I don't know enough about java, only what I drink ,  to dig into this so I hope some one can take a look at this.  

Prolaznik,

Have you figured this thing out? I have not had time to research it more and it is starting to drive me crazy. I hope you had some time. Let me know please.

not a bug, it's a plugin in tinymce editor.
/templates/base/scripts/BxBaseEditorTinyMCE.php

look for ,autosave and remove it (3x)
this will disable it site wide not just the mail box.

That did it, thank you very much.