In brief you did:
-went to the ALT mode
-set shutter speed to 64
-pressed SHOOT_FULL being still in ALT mode.
When you are in ALT mode the key presses have different meaning than outside ALT mode. When you are in ALT mode then the SHOOT_FULL button does not take a photo, but runs a script. And it seems that you run script that display smile
So the correct way to achieve the result you want is:
-go to the ALT mode
-set shutter speed (e.g. 64)
-
go out from the ALT mode-press SHOOT_FULL
However, it is possible that you'll have to be in manual mode (not auto/Tv/Av/easy or others) to get overides working well. Try these and post feedback.
EDIT:
The other thing to be checked - in overide menu you should have an option called like
Disable overides and it has to be set to
off (means: not disable overides - a little confusing).
Regards!