You might have already tried this, but just in case not: I have had times when my browser cache has apparently had things all confused while I sit here with two Dashboards and identical logins at one IP. So, do you make regular use of something like CCleaner? Also, you might give the folks at your server a call. I have my sites at BlueHost, and the support staff there has always had a solid solution every time I have had any trouble.
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