It could just mean the person is very busy. It could mean you email did not find the way into their email box (maybe spammed). It could mean the person is on vacation, out sick, getting caught back up, etc. It could even mean the person is not as involved in the process currently.
I would not assume it means anything.
If it has been a while since the contact, I may consider following up again. If you have a phone number, you might just give them a ring and ask about the status of the search and very quickly let them know you are still interested.
We hired someone in January. To get everyone phone interviewed took weeks by itself because of scheduling. We than had to wait several more weeks to start in-person interviews because in an academic setting there is usually a lot of people that need to be or liked to be involved.
Brian C. Gray
Head of Reference & Engineering Librarian
Kelvin Smith Library
Case Western Reserve University
http://blog.case.edu/bcg8bcg8@case.edu