500 errors when signed into applications
2010-02-02T12:30:00Z
2010-02-02T19:00:00Z
Disruption
We are currently investigating an issue that is affecting many App Engine applications using the Users API, causing the problematic behavior and 500 errors reported. Clearing your cookies, specifically the ACSID cookie, fixes the problem. You can follow the status on the downtime forum here
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Update(11am PST): A fix has been issued and this should be considered resolved.