Great discussion with a recruiter - then followed by a long period (weeks) of silence. Then an invitation to come in, followed by another long period (weeks) of silence. Then another invitation to come in - several weeks into the future. Not even a discussion with the hiring manager. What? Not sure what they are doing or what is going on there - but as the adage holds, if a company does not respect your time or provide common courtesy to their candidates - avoid it. This may be a sign of their culture.

First phone contact. Then a screening with the department head. Then a panel interview. Then HR. It was fine. It was easy. You can do it. The interviewers were very nice and kept you at ease.