Statistics report

I have upgradet 3 server from 5.11 to 6.0.1CF1 and on 2 I have problem to get Statistics Report to start again. On one it helped to do compact on statrep.nsf and events4.nsf I have also opened events4.nsf changed time and saved, but it will not generate stat report. Have also restarted server. The command “tell collector collect” works on only one. Anyone that has any sugestion what may cause this. Are there any debug command for the collector?rgds Kjell