In IE9:

1. Set atto auto-save frequency to 5 seconds
2. Go to My Profile -> Blogs -> Add a new entry
3. Type some text, wait for it to be saved

Expected result:

1. Text is saved correctly

Actual result:

1. 'Could not connect to the server. If you submit this page now, your changes may be lost'

It seems the text is saved correctly though - because its restored when you come back.