Ever since I installed osx and xcode on my new macbook (about a year ago) I got this weirdest problem I can't get rid of. Anytime I press Esc key in xcode, one character gets printed. I can't copy paste it here (it won't paste anything), but it looks like upside-down question mark. When I paste it to the Pages app, it looks like ordinary exclamation mark, probably because of different encoding or something.
This is very annoying, how can I get rid of it? I sure hope it is not a desirable feature. Reinstalling xcode or upgrading from 4.2 to 4.3 didn't help, upgrading osx from 1.6 to 1.7 didn't help either. I would prefer to avoid reinstalling of osx if possible