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The error message in my previous comment is due to a bug in Proj4js. Regardless of which object being not ready, it states that the source object isn't ready. Strange.
When using Proj4js' error handling with an alert box, I get "Proj4js initialization for EPSG:4326 not yet complete". Which contradicts the readyToUse flags, which suggested that 2400 was not ready, but the 4326 was...