I think the recommended memory limit of 12Mb needs to be increased.
> It is also possible to set it to unlimited. While this is true but the setting is there for a purpose, it stops php programms from using all your memory and grinding your server to a halt. This is a possibily if you set this to unlimited. Not something I'd recommend is done on a production server :)
Unfortunately, web host support won't change the settings at all as the web site in on the shared server. Of course, I can (for the huge price) get a dedicated server :-(