If the first thing you do in the htmlnotebook is press the x button, you can delete your prompt :(
Can you give us more details about this one. I am not seeing it. What browser? What version of the code? Other things needed to reproduce?
Sorry. Google chrome most recent build of the htmlnotebook branch.
Basically all I did after starting was hit the "x" button
Here is a screen shot of the result:
Since the prompt is in a separate div now, this should not be possible anymore.