Settings disappear when you click them

I'm having a strange problem with Unity.

When I select a text box, for example, in the inspector, everything below it will disappear, including the text box! You can still click in the objects that have disappeared and change their values, but you can't see what you're doing. The only way to make these settings re-appear is to click at the bottom in some blank space.!

Has anyone else encountered this problem? I've posted an image of what happens below. It's an image of settings for the same object, before and after I click on the Scale x text field.

Thanks