I know that such switches do happen. One imagines that most of them take place more or less out in the open, and some probably involve some kind of backchannel discussions between the applicant and a search committee chair (and, I presume, the chair of the department.) I figure there must be a faculty visit of some sort, probably conducted out in the open? How do professors negotiate the confidentiality/privacy issues, yet still undertake the traditional seminar and question-and-answer sessions?
Anyone got any stories to tell? The e-mail inbox is open (email@example.com).