CreateWorld method zeros TileDimentions Vector in MMO demo

As you can see from the screenshot, on entry to OperationCreatedWorld, request.Parameters[2] holds a vector3 containing the values 1000,1000 and 0

Once that request has been passed into CreateWorld and returns operation, operation.TileDimensions contains a zero Vector3 instead of the 1000,1000,0 and causes errors later on.

I can't debug into CreateWorld and have no idea what is going on.
FYI: operation.IsValid = true

VS2013, Win10