Ruby on Rails and Session issues



I developed a small application using Ruby on rails and Flex. for
designing i am using Flex application and for business logic i am using
ruby on rails. i completed my development work and now i am testing my
app but when i tested the application with multiple user for eg for 10
users for some user data are getting mixed dont know that where is

does any body knows that what the problem… please help

Thanks and Regards,