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This might not help much, but this login here has nothing whatsoever to do with OpenID, so it is not surprising that you can login here while not on the three others that are (I assume also MO) all somehow handled by stackexchange via OpenID.
I just came here to report that I'm also having trouble logging into MO. I get the same error message as Michael. I also use google as my OpenID.
I just checked that I have no problem with the same login-mechanism. So it does not seem to be a general problem.
The problem seems to have gone away!
On Gerry's comment:
A novice was trying to fix a broken Lisp machine by turning the power off and on.
Knight, seeing what the student was doing, spoke sternly: "You cannot fix a machine by just power-cycling it with no understanding of what is going wrong."
Knight turned the machine off and on.
The machine worked.
It might help if you state the OpenID provider you are using since the problem might be caused by the provider (as it did some months ago when MyOpenID went down).
@Kaveh:
Michael said:
I use google as my OpenID. I have no problem logging in to google itself.
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