Server doesn't start backup automatically after discovering the client and setting its default directories to backup

First of all, I have to say: thank you so much for this great application, I’ve tried CrashPlan, Bacula and Amanda but I found UrBackup the best!

I’ve installed the server and the client on the same Debian machine. I set the client directories to backup after the the server discovered the client, but the first backup doesn’t start automatically.
What’s the problem?

Does it still not work? Can you provide us with a log file of the server? Can you look in /usr/local/var/urbackup/data/settings.cfg if the default_dirs got correctly propagated?