At the risk of getting Dooced, let me say this:
Two departments in my building got new supervisors today. One new supervisor introduced herself to all her employees, shook their hands, learned their names, and was generally cordial by all accounts. The other supervisor spent the day moving into her new office, sitting alone in said office, and being unresponsive to e-mails.
Guess which one was mine.
She’s had a busy day, so I’m willing to cut her a little slack. If she doesn’t a.) hold a department-wide meeting or b.) at least reply to my pleasant “welcome to the department can we have a meeting about the database at your convenience” e-mail, only then will I start to become truly hesitant about this new supervisor.