this should have been in the mcse exams
edit: groups.google.com undoubtedly has your answer though
edit x2: yep. http://groups.google.com/group/microsoft.public.visio.general/browse_thread/thread/93b9f76c106a895a/2028490f40350de8?lnk=st&q=cannot+drag+shapes+in+visio&rnum=1#2028490f40350de8