Erratic Invalid Viewstate issue in a .NET application

Question

I seem to be getting a \"invalid viewstate\" every now and then in the event viewer for my ASP.NET application.

Most of them (95%) seem to be referencing Scrip

Answer 1

I have just narrowed this issue down for me to a user with Trend Micro antivirus and the errors just started to occur after he updated his trend micro software on 5/21/2009. No errors before this date.