[Serusers] fifo issues with ser cvs head version

[Cameron Beattie]

I have installed the cvs head version of ser as of today. Ser seems to start 
OK but serctl moni reports:
Error opening ser's FIFO /tmp/ser_fifo
Make sure you have line fifo=/tmp/ser_fifo in your config

I am using the same ser.cfg file as was running successfully on v 0.9.0. 
Could anyone advise what I'm doing wrong?

ser.cfg
debug=3
fork=yes
log_stderror=yes
dns=no
rev_dns=no
fifo="/tmp/ser_fifo"
fifo_db_url="mysql://user:pword@localhost/ser"
sock_mode=0666
listen=ip.ip.ip.ip
port=5060
children=4

Regards

Cameron