i had a problem with CAT 3.4 drivers so i went back to 3.0.
i don't really know how to explain the problem, but in HL: DOD the 3.4 drivers actually changed the configuration of my keyboard. i don't use the default settings (wasd = moving forward, backward, etc), i use the arrow keys to move, Ctrl to jump, Shift to kneel, and Enter to go prone. anyway, when i would start a game and proceed to move forward i would go into the kneeling position. when i tried to change the settings back nothing would respond. it wouldn't let me assign anything on the keyboards number pad. and, when i tried to assign "drop primary weapon" to PGDN (not KP_PGDN), it would just jump down to the bottom of the list...so Catalyst 3.4 drivers = no good for me being that DoD is basically the only game that i am hopelessly addicted to.