Logs locked after restart on windows

• On Windows XP, I download the nightly build (2011/09/15)
• I execute nuxeoctl.bat
• I start the server
• I open the http:/localhost:8080/
• I "next" each page and wait for restart
  Problem
• Into the "server.log" tab, I have this written :
  Le processus ne peut pas acc�der au fichier car ce fichier est utilis� par un autre processus.
  Logs are not updated into this tabs

A lock seems to be let on the server.log file after a restart on windows.