Some of the links on my site (search.fibis.org links from the search results page) recently stopped working with a 503 error "Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. ".
I have tracked this down to me using % as parameter values in URLs. Take them out and it works fine. This behaviour has only just appeared. Have DreamHost changed some server or php settings anywhere? And is there an easy way to get around it as it'll be a pig to change all my code.