Cute Editor does'nt persist view state upon post back when used with ajax update panel in Safari browser ( latest version 4.0 as well older versions 3.0.4)
This can be replicated in your demo example also...
Enter some text in the above link and hit the button quickly, it won't persist the text. If you wait for 2-3 seconds until the word count at the bottom toolbar updates and hit the button, then it persists the text. This also happens in chrome browser.
But it works fine in IE and Firefox, even if you hit button quickly after entering the text.
Please fix this ASAP, we are facing the wrath of our users.