PHP session variables leaking

Hi,

I'm using session variables to store user information from a registration page, their name, address etc. Occasionally users will see other peoples information in their input data fields when they arrive at the registration page, these people are always on the server at the same time.

The server is shared and seems to be suffering from over crowding, pages sometimes take up to 30 seconds to load.

I need to figure out if its the busy server which is leaking the information or the code I am using which is causing them.

The code is from a wordpress plug-in, an example of the user registration page can be found here:

http://www.instinct.co.nz/?page_id=66&total=100

The source code for the page can be found here:

http://pastebin.ca/161450

The page is submitted to a function where the user data is stored in the session variables, the source code for it is here:

http://pastebin.ca/161446

Can anyone see where the session leaks might be occurring within the code?
How can I determine if its the server which is causing the problem??

Thanks in advance.
Michael.


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