Session / cookie issues

Hi all. I mailed some time ago regarding a cookie/session issue I am having and thank you all for your useful and knowledgeable responses. I have now used 10 separate testers and 9 are able to progress through a 3-stage form process that validates data as it goes along and enters the data into the session array - enabling the user to go back and see previous forms pre-populated with their selected data (cahcing is enforced on these pages). However, the client still has issues and I have confirmed that their browser is rejecting cookies. They are using IE on Win XP and have Internet security set to Medium. I set mine to the same, used IE to go through the process and had no such issues. Can anyone tell me if I am missing something obvious? -- http://www.web-buddha.co.uk http://www.projectkarma.co.uk