OK, I have a pretty strict filter going on due to the issues I was having with people leeching the site and causing my hosting company to fire warning shots across my bow.
I'll have a look and see if I can figure out what's going wrong (it doesn't seem to do it for me) as that sounds pretty dire, but to give you some idea why I did it I'm very much skirting along the edge of what's allowed on a shared server in regards to CPU load.
And before someone says about using a dedicated server, the site makes no money and the banner ad just about pays for the existing hosting with a bit of personal input from me, dedicated servers are teh expesiveness...