When managing products, in Catalog => Manage Products, I filter out the products I want to modify.
I then select Actions => Update Attributes.
I select the attribute I want modified, in this case, CAR_BRAND which is a custom multiple selection attribute I have created and added to the DEFAULT attribute.
It is not required.
I save, go to the front end and NOTHING HAS CHANGED.
Am I doing something wrong or is this a magento bug?