How do I set up Dropbox API for use on a multiple server environment/ load balancing?

I only changed the auth_finish part that retrieves the access token. I didn't change any function within the sdk. So if I change the sdk functions to use cookies instead of sessions it might fix this problem. I appreciate the insight.

If I can get the php sdk to work in a load balancing environment, can I hand it off to Dropbox and have them maintain the code officially? As more and more people are moving to services with multiple servers, I think it would be helpful.