Well then,When I visited you site I also had the same looping issues.
But I also noticed that Sirdude was online and is a admin on your site.
So I assumed he was working on it.
If he is I don't want to suggest anything more at this point in time. I would hate to suggest something to confuse the issue by two people working on the problem at the same time.
Other than clearing out your session files and checking folder/file permissions.
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Blue Man Group