2 things: 1. Care to post a default so it's possible to explore? Couldn't figure out a working combination. 2. When you hit an error, would be helpful if you k

2 things: 1. Care to post a default so it's possible to explore? Couldn't figure out a working combination. 2. When you hit an error, would be helpful if you kept the previous selection prefilled (either via AJAX request or passing along the previous selection in the URL).