Custom Process to update custom field

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Hello! I have a Custom Process on UpdateAnswer event. It works fine, but fails to update a custom field ("major_change", a Menu Items field). The test harness shows the field correctly set, without errors, but when the Custom Process runs, the custom field is not saved in answer object, while other fields are correctly set and saved. I am using Connect v1_2 and RN version November 2012.

$md = $answer::getMetadata(); 
$cfType = $md->CustomFields->type_name;
$cfMetadata = $cfType::getMetadata();
//$answer->CustomFields->c = new $cfMetadata->c->type_name;  
//This part is shown in RN guide, but if I uncomment it, 
//the Custom Process doesn't start at all