Error "An extension of name ‘<x>’ already appears in extension collection" with .Net 4.5 RC?

Do you happen to see any of the following errors when you upgrade your machine to .Net 45? System.Configuration.ConfigurationErrorsException:An extension of name ‘ udpTransport ‘ already appears in extension collection. Extension names must be unique. System.Configuration.ConfigurationErrorsException:An extension of name ‘netHttpBinding’ already appears in extension collection. Extension names must be unique. In .NET 4.5, WCF has added…

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