Rails ActionController::InvalidAuthenticityToken All browsers

I'm having an issue with one user. No matter what he does he ends up getting throwing an ActionController::Inv开发者_运维知识库alidAuthenticityToken error. I have tried having him clear his browser's cache, cookies, etc. He gets this using both FireFox and Internet Explorer. I'm at a loss as to why this would be occurring for just him. Everything I do in every browser works fine.

He is running Windows Vista Home.

Our stack:

• Ubuntu 9.10
• Ruby 1.8.7-248
• Rails 2.3.9
• Passenger 2.2.11
• Apache 2.2.12

Thanks!

Do you use page, action or fragment caching? Be sure you are not caching the authenticity token.