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I am having problem creating a synth. Each time I try to synth, I am return with an authentication error message.
You don't happen to have a long password for your Windows Live ID, do you (longer than 16 characters)?
I ask, because I've seen that choke the process of signing in before. If you do, try changing the password to something a little shorter (16 characters or less) and see if that works.
If you already had a short password, does your internet connection go through a proxy (say at a workplace)? I've also seen this be a problem.
My password is less than 16 character.
Yes I am doing it a workplace through a proxy. I don't seems to be able to do any proxy settings on Photosynth. Does it take on the proxy from IE?
I believe that is the case, though I'm no one official nor even especially technical.
Here is a topic from the old Photosynth help forum that might shed a little light on your problem.