As of this morning, I'm seeing a limit of 500 characters in my generic keyword field. Where are my "add more" buttons to allow for additional keywords? Has this been phased out?

There are fellow sellers who, as of this morning, have 5 fields @ 500 characters each. They have the "add more" button under the Generic Keywords field. Why would this be?

Any logical explanations are welcome! Seller support isn't able to explain. 6 cases including 2 hangups later and I'm no where. Moderator comments welcome too. Thank you.