Hello, mighty helpers of Daniweb! We have been running this application for two years and have hundreds of users distributed at many customer sites.
Suddenly, in January, one particular user logged in, clicked Ordering and got "Page not found" in the secondary pop-up window. The only workaround was to create a new user record. That worked for three weeks. Now that same user sees the first part of an IMG element rendered HTML on what we call the "Customer Home" page. Created a new user record and it's working again. Oh yeah, and the original account is now working again, too.
Here's the weirdest thing, though: We have had this user go to other workstations in his store and at other stores, and he observes the same problem. All of these are on the same WAN/LAN. Test outside their network, and these problems do not occur.
Because this problem can be replicated for this one user on ANY workstation inside their network, it does not appear to be a workstation problem. Just in case, I have asked them to reinstall Internet Explorer, recreate the user profile, or even replace the workstation temporarily to eliminate the possibility that it originates there.
Application details: ASP.NET application developed by a third party. It runs on .NET Framework 1.1.4322, IIS 6.0, and Windows Server 2003 SP1. SQL Server 2000 SP4 is the database and all users use IE 6 or 7.
Other items of note:
1. The problem does not occur for this user in the Firefox or Opera browsers, even within their LAN/WAN.
2. No one else from this customer or other customers has complained of this problem.
I'm at a total loss. Any ideas?