if I'm not wrong that's because you are editing user profiles as admin, and that role has permissions to update any user profile bypassing the "required" property.

But for normal users... the required property will be enforced.

Closing this as not a bug.

Thanks for the report, feel free to comment/reopen it if necessary.

Ciao

Here is what I came up with for user profiles (./user/edit.php) . This will
force any custom menu field to include a select one option by default and
enable required validation on that field.

File: ./user/edit.php
Affects Validation Behavior for element: profile_field_Otherfields
Affects Validation JScript: validate_user_edit_form_profile_field_Otherfields(element)

Notes:
5/14/2008: Fixed Custom Field List Box Validation (required) behavior.

FileName: ./lib/pear/HTML/QuickForm/RuleRegistry.php (Starting Line 284)

} elseif ($element->getType() == 'select') {
if ($element->getMultiple()) {
$elementName .= '[]';
$value =
" value{$jsIndex} = new Array();\n" .
" var valueIdx = 0;\n" .
" for (var i = 0; i < frm.elements['{$elementName}'].options.length; i++) {\n" .
" if (frm.elements['{$elementName}'].options[i].selected) {\n" .
" value{$jsIndex}[valueIdx++] = frm.elements['{$elementName}'].options[i].value;\n" .
" }\n" .
" }\n";
} else {
$value = " value{$jsIndex} = frm.elements['{$elementName}'].selectedIndex == 0? '': frm.elements['{$elementName}'].options[frm.elements['{$elementName}'].selectedIndex].value;\n";
}

Make sure First Option of Custom Lists are of type Select-One:

FileName: ./usr/profile/field/menu/field.class.php (Line 12-28)

/*

• Make sure Custom Lists are Zero Indexed
• with Select-One list type behavior.
• JTM wink
  */

function profile_field_menu($fieldid=0, $userid=0) {
//first call parent constructor
$this->profile_field_base($fieldid, $userid);

/// Param 1 for menu type is the options
$options = explode("\n", $this->field->param1);
$this->options = array();
$this->options[-1]="Select one"; // Default List option for validation Select-One.
foreach($options as $key => $option) {
$this->options[$key] = format_string($option);//multilang formatting
}

/// Set the data key
if ($this->data !== NULL) {
$this->datakey = (int)array_search($this->data, $this->options);
}
}