Strange, I tested the code before posting and it works fine for me. Do you've some code in other events of the checkbox that could interfere?

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>Same thing - the code gets executed, the checkbox blinks checked / unchecked if initially unchecked, and vice versa if checked.
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>But with the mouse it works as expected.
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>
>>Try

LPARAMETERS nKeyCode, nShiftAltCtrl
>>IF nKeyCode <> 32
>>	KEYBOARD "{SPACEBAR}" PLAIN CLEAR
>>	NODEFAULT
>>ENDIF		

>>