From your last comment, I guess that you are not preventing pages from going into cache. You can use the following piece of code at the top of every page to prevent the page from going into cache. This is very essential for ASP pages.
Code:
Response.AddHeader "pragma", "no-cache"
Response.AddHeader "cache-control", "no-cache, must revalidate"
Response.Expires=-1
Then you need to clear your browser cache and proxy cache.