Hi James,
Did you end up changing any of the model conditions? This can certainly cause a problem.
Ensure that all the conditions on your models are referencing fields (and or objects) on your instance that actually exists.
It may be a case that the conditions may be restricting the load as the perameters are not being met.
Also make sure that you have a model selected for your tables and so on (I have not tested your XML so this would be obvious to anyone loading it).
