Constantly toggling between raw & cooked mode like that will result in some key presses ending up to console instead of to your app (it can depend on timing and such). Any such input in console will block pending output.

This could be your problem.

In order to capture ALL key presses you must turn on raw mode, and keep it enabled for the duration you wish to read the raw input.

[ Edited by Piru 05.09.2012 - 21:21 ]