Magento does not use specified default value on attributes of type yes/no

Question

I added a new attribute with Default Value set to Yes.

I added the attribute to my attribute set and edited the product, but it is set to No by default.

How can I fix it?

Answer 1

This is not a bug. It's a feature.
The default values serves as "default" from now on. It is not added to products existing prior to setting this default value.
If you create a new product, you should see the "yes" value selected.
There is no "out of the box" way of setting the default value to existing products.