The Macro TaskRecurringM working but, if I open the form I got this message "Access was unable to locate the macro or VBA function. If you are trying to call a macro, make sure that the name of the macro and the name of the macro group are spelled correctly.
If you are trying to call a user-defined VBA function, be sure to use the following syntax:
=FunctionName() or =FunctionName(argument1,argument2,...)
Make sure that the function is either:
Defined in the code for the form or report.
- or -
A public function that is in a module (not a class module)".
Also, I faced problem, The CheckBox control behavior different, like you have to click it 3 times?!.

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Reply from Alex Hedley:

Did you rename the macro but not change the button click event?
Have you set the checkbox to triple state?