I can only add 2 levels

Seems that once I ad 2 levels I can no longer add any more. My add new button is gone. See here:
http://www.evernote.com/shard/s35/sh/45d7c72f-1781-4c13-9054-6b5801b34959/e728cfee7546b15970cb9bcc187e22ea

If I remove a level the Add New button re-appears. I tried repairing the tables but it shows that everything is fune.