Resolution of OpenID 2 (2.0) issues [BUG BUG BUG]

In perusing the forum with regard to issues with OpenID 2.0 access to Zotero, I stopped over at StackOverflow and my impression is that they use the Zend stack, but they have no problem accepting verisign labs credentials.....

Could someone explain what the current situation is, i.e. whether Zotero is using a different stack than StackOverflow, and if not, why their authentication is working but Zotero's is not?
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