I had the same problems with opensuse 12.3 and pure-ftp. Google shows me the the following thread and there was a solution. if pure-ftpd is not starting with opensuse 12.3, you have to chanage the pure-ftpd.conf like this:
# Fork in background
Daemonize no #yes is standard
it seems it is a bug.
is the source of my information. at the moment it seems working.