Only on WP Visual Editor – "enter" key does not work.

When I am typing a post into the visual editor and want to start a new paragraph my “Enter” key does not work, it does nothing. This is only happening since the upgrade to 3.2.1. “Enter” works as usual when I am not in visual mode or not using WP at all. I have no problem with my keyboard, have not changed my WP theme and have no new plugins.

Not a big problem but a bit annoying to keep changing back and forth between visual and edit mode so often. It must be something simple to do with the new WP version.