Search broken

Hi, ever since upgrading to 2.5 my search function is broken — you click on Search and nothing happens.

I’ve done the upgrade several times, the last time deleting everything (except wp-content) first. The code is the same as on other 2.5 sites that are working fine.

I’ve turned off all plugins. Have also tried with Search Everything enabled.

Definitely stumped and could use help. Here’s the page:

http://www.yale58.org/members/

thanks