Serious Log-In Trouble

  Claymation 00:50 19 Dec 2006

Greetings gang.
Just found the site and was hoping someone could help me with a perplexing situation.

Suddenly at the end of last week, I have been unable to log-in to MSN adCenter, for no apparent reason.
I'm getting a session timed out error.
"For security reasons, your session has timed out, but feel free to try again."
Went through some cookies and security settings with their support team over the phone, and they pretty much determined it must be my machine.

No other secure site that I log in to daily is giving me problems.
Anyone ever experience such a thing?
Any ideas?

System restore did not resolve the issue either.
Windows XP.
Problem occurs in both IE and Firefox.

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