I have a login system that I built that uses urls and cookies to pass the session data. A lot of my users are reporting that they log in fine but when they browse to another page they appear to be logged out.

This has been a very frustrating bug to try to squash since no matter what I do I cannot reproduce the error and everything works exactly like it is supposed to. I have even went as far as completely blocking cookies and useing the exact same browsers they are (which range from IE to Firefox) and everything still works fine.

Does anyone know why some users would have problems with their sessions getting dropped and others would not? I am sure I could fix the problem if only I could reproduce it.

Some users report their age changing to the date or their name changing to the DB username