Re: MultiSelect not showing existing values

If you create your form fields correctly, the form helper will sort all of this for you 

echo $this->Form->select(
    'Model.field',
    $options,
    array('multiple' => true)
);

Source: http://book.cakephp.org/2.0/en/core-libraries/helpers/form.html

I would focus on trying to get the conventions working rather forcing the selected options.  If you have your data array correct then the above will output a multiselect form field with the right options selected.

HTH, Paul.

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