Weird impersonation issue

Just recently, we started getting a weird impersonation problem on one
of our web apps (which used to work).

IIS is set to use Windows Authentication, Anonymous is disabled
Web.config specifies to use Windows Authentication, Impersonate = true
Web server is trusted for delegation.

The app goes out to a file server (on the local network) to retrieve an
image file.

Here is where it gets weird - If I run the app from my machine, the
authentication and impersonation work and I can get the file to
manipulate it. If I go to the Security Log on the file server, I can
see my User Name and the Success Audit.

However, if I go to any other computer, still using the same domain
account, the Impersonation does not seem to make it all the way to the
file server. I use
System.Security.Principal.WindowsIdentity.GetCurrent().Name to get the
user that the process is running under and it returns my user name,
however, on the file server, there is a failure audit from
WEBSERVER\Anonymous Logon.

I have had another person test it, and they get the same results - it
does not work from their machine, but if they log on to my computer, it
works fine.

Anyone have any idea what is going on here? Why is this only working
from my computer? I thought I looked at all the relevant settings in
IE, etc, but can't find any differences. Any ideas?

.

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