Is there a direct way to check if a class is registered correctly? And why would this differ when using binary/XML mediums?

My binary serialization problem persists (sorry!) when using fast_binary_archive though the same works when using the XML serializer.

Also I thought I'd try and see what happens when using an archive implemented from scratch according to the boost docs. Is the implementation section of the archive class reference up to date with 1.34.1 ? I was getting hard to decipher template error messages using VC++ 7.1 SP1.