multisystem conteny woes: intermediateserializer

Having a weird problem. I’ve been developing a game on my desktop, and works find there. I’ve been testing it on my Mac Book, and it works fine there too. Now, I’m away and on my laptop and for the life of me, I cannot get my content to build. It is XML content made using IntermediateSerializer. I’m getting the message:

Unable to load one or more of the requested types...

It is not a problem with the project or the content, as it works on multiple other systems. It is just my laptop that has the problem. I can serialize and deserialize fine. Any thoughts on what to try would be appreciated