I've found this problem after PR1.2 upgrade OTA in Spain:

- When I receive a phone call and push the green answer button, the screen makes a strange glitch, it seems to move to the bottom side of the phone and you can even see a little glimpse of the desktop wallpaper and widgets.

- After that, I can push again the button to answer the call without problems.

Any idea how to fix it? Maybe a problem with some other applications/widgets?