5) The default mouse or trackpad acceleration settings may be bad.
@Romano: Click to focus is the only supported focus model in 11.10 (and older releases?). In the same sense as having a global menu bar isn't an option anymore, click to focus isn't an option either. You still have the option to change your system, but not in a way that is supported. Since you've already tweaked your system, you can tweak it to turn off the global menu bar, or perhaps try something like what was suggested here: http://brainstorm.ubuntu.com/idea/27724/
I remembered another one.
5) The default mouse or trackpad acceleration settings may be bad.
@Romano: Click to focus is the only supported focus model in 11.10 (and older releases?). In the same sense as having a global menu bar isn't an option anymore, click to focus isn't an option either. You still have the option to change your system, but not in a way that is supported. Since you've already tweaked your system, you can tweak it to turn off the global menu bar, or perhaps try something like what was suggested here: http:// brainstorm. ubuntu. com/idea/ 27724/