Moving DataPortal from Local to Http

I moved the DataPortal from running Local to be an HttpProxy, as follows:

 <addkey="CslaDataPortalProxy"value="Csla.DataPortalClient.HttpProxy,Csla" />

<

Whenever I try to run a Fetch method in the BO, I get weird "isSync == true" errors.

Any thoughts? Am I only able to run Async methods on the remote DataPortal? If I change to run FetchAsync versus Fetch in the BO, then I get past this, but I am getting other issues, like "Type GenericPrincipal must implement IMobileObject", which it does by inheriting from the CslaPrincipal.