ARM requires to enter a comment in almost all dialog windows before the OK button is enabled. The comment textbox has a watermark text ("Please enter a comment"). If you click on the textbox and start typing the watermark text fades out. Meanwhile the typed text and the watermark text overlay which makes the entered text unreadable. I know, it's only for a quarter of a second - but for a fast 10 finger keyboard user this is a long time. And sometimes it's the small things that make the difference between an enjoyable or an annoying software experience.
