Users seeing each others userdb info

[macky@staktrading.com]

Hi all,

I have set minivend up so users can only purchase when they have logged in.
There is a message showing their login status as below:

[if session logged_in]
   <B>
   You are currently logged in as [value mv_username]
   </B>
[/if]

[if !session logged_in]
   <B>
   You are currently not logged in.
  </B>
[/if]

Randomly, someone elses name will show up in [value mv_username]. Then the user can got to the checkout
page and see the other persons address and details.
I first thought this was todo with my proxy server but clients have reported it from unrelated ISPs.

Anyone seen this one??

Macky..