I'm on Ubuntu 11.04. For reasons which completely elude me, Nautilus has suddenly decided to ignore the typed letter 'o' when I try to name or rename files. Same problem with the location bar.
There's absolutely nothing wrong with the key. In fact, capital O (shift-o) works just fine. Copying and pasting 'o' works too. The letter 'o' works with every other application.
Nautilus version is 184.108.40.206.