WinCC - button stop working

Hi,
I'm developing a new project and have several buttons in my screens. When I simulate almost everyone has stopped working in my simulation. To get it to work I need to copy and then paste the button and then it starts to work normally again. Any solution except the time consuming copy/paste?
/Tim

EDIT: Also I/O fields are the same problem

EDIT2: I have tried compile rebuild

I've had that problem some times and have never figured out why. It's as if it needs a refresh to work again. You could try simply moving the button one pixel, or move it to another layer.

Try Right-clicking the HMI in your project tree -> Compile -> Software (rebuild all) - Sorry I just saw that you tried that.

Which version of WinCC?

Thanks for all the suggestion.
It worked when I changed it to another layer
/Tim