Ah, yes, the MasterType directive, obviously required by the
Department of Redundancies Department. It sure looks redundant to have
the @Page directive with the MasterPageFile attribute followed
immediately by the @MasterType directive with the identical value in
the virtualpath attribute. I suppose there must be times where these
two directives would provide non-redundant information to the page.
Right? Or am I being overly optimistic?

Thanks for the info. That did fix the problem.