I had that problem when I was attempting to import the iPhone’s predictive text shell, but obviously that was causing… A LOT of problems in every app… So I don’t think that is your problem… The only time I have seen something like that happen is with the wireless keyboards and mouse (mice?) or when using the iPhone and accessing the fluther webapp. I really can’t think of any reason it would be happening in another program, I mean if it were just fluther, then you could blame them, but the fact that mail is doing it too…. Do you have any plugins that might be causing the problems? Or background scripts, perhaps? Oh I did just think of something, perhaps the Mail app has a problem in it, and the App is reading input when it shouldn’t be, as in, perhaps there is a small fleck of dirt, pressing the key, but only type sensitive apps, such as Word, Mail, or the internet, are reading it as input… I know you can tell different apps on a mac to read keystrokes differently. I am not sure, I am just thinking out in pixels right now. My advice would be to 1) clean the board, then 2) reinstall Mail, and\or Safari, and\or OS X.