fullscreen and bitmap checkpoint error "Cannot create bitmap checkpoint"

[meuline]

My script open IE but my first problem is:
IE is not always open in full screen and I is not able to click the button to enlarge the window.
To resolve this problem I used "Fullscreen".

And then I want to be sure that my page exactly as expected. This is my second problem: I want to make a bitmap checkpoint.

1. Insert checkpoint > bitmap checkpoint
2. I clic on my object level "Page"
3. I have the error "Cannot create bitmap checkpoint"

If my IE is open in large, but not in full screen (F11), I have no problem.