Log-rotation FeeBSD 8.2

Hi all, something strange: I am trying to setup newsyslog to rotate logs of FreeRADIUS 2.1.11 my setup string is looking like [code] /var/log/radius.log freeradius:freeradius 644 7 5 * Z [/code] but after rotation no logs are writing to /var/log/radius.log until restarting freeradius But if I just run echo "" > /var/log/radius.log all logs are clean and writing well What am I doing wrong? -- Best regards, NewUse.