Cognos BI 10.1.1
Error when you try to surf to Cognos Connection in Internet Explorer
The User Capabilities Cache cookie cannot be decoded.
Close all Internet Explorer windows and start again.
You are logged into a other Cognos BI server Cognos Connection in other Internet Explorer window, that make it not possible to login to a new Cognos BI server.
Workaround is to use one Internet Explorer for your development Cognos Connection, and Firefox for access to your Production Cognos Connection.