Comment 1 for bug 464099

The cause of this is because it does not rebuild the address bar after a form submit.

Therefore it remembers values (eg. spots ticked) after a single form submit, but not a second. So if you use the date nav bar twice:

* the first time it remembers the spots, but fails to rebuild the addressbar
* the second time it doesn't have any values to pass through, causing weird behaviour.