projects.blender.org - bug tracker - aaarrrrghhhhh!

I must be stupid, but I can’t work out how to search for bugs by date range and keyword.

The ‘Build Query’ page seems to be the right area:
http://projects.blender.org/tracker/?atid=498&group_id=9&func=browse
Advanced queries->Build Query

But whenever I try to save changes I get an error:

Error Invalid Open Date Range

or

Error - double submit
You Attempted To Double-submit this item. Please avoid double-clicking.

Help!