Session_Start Problem (Fatal Error)

I'm using Mambo Open Source CMS to run a site I'm building, and seem to have a problem logging into the Administration Tool. It comes up with: Fatal error: session_start(): Failed to initialize storage module. in /home/hetbweb/public_html/administrator/index.php on line 64 I've looked at various things that could cause this, and finally contacted my server support who said: "It's a PHP bug which they still havent fixed as of yet, as soon as the fix becomes available we will update PHP. It may be worth looking on the mambo forums as there may be a patch to resolve this for your script." Does anyone know about this, and if so, is there a fix or work around or anything?!!!! Cheers Nunners