  Recently proposed forms for gauge transformations with finite parameters in
double field theory are discussed and problematic issues are identified. A new
form for finite gauge transformations is derived that reveals the underlying
gerbe structure and the close relationship with generalised geometry. The
nature of generalised tensors is elucidated, and in particular it is seen that
the presence of a constant metric with split signature does not restrict the
doubled geometry, provided it is a generalised tensor rather than a
conventional tensor.
