Your question about default values helped me figure it out. In phpMyAdmin the field ‘link’ with Null = YES and Default = NULL did not allow the Insert button to work.
If I required the link field, Null = NO and Default = None, the Insert button would work. But I wanted the link field to be optional, so I found what would work was Null = YES and Default = ”.
Getting the empty quotes, ”, into phpMyAdmin was goofy, so I ran the sql:
ALTER TABLE cdr_books
ALTER link SET DEFAULT ”;
Then I went into WP Data Access ALTER section or “Data Designer” for the database and clicked “Reconcile”.
At this point I’m good with it working. If you still want to take a look from the wp-admin back-end, just let me know. I could let you in for a few days. I’ll use your contact form for that.
Thanks!