Clear or rotate your log prior to each raid.
Nice, but not for me.
/combatlogto verify if your logging is on or off.
2008-02-05 - (version not recorded) ∞
The log file that WoW uses is in
\Program Files\World of Warcraft\Logs and is named
Make sure you are in a zone that is not automatically logged (eg. any raid zone). Enabling the combat log locks the file as in-use by World of Warcraft and you won't be able to delete it unless you manually disable logging, or leave the zone you are in.
Is this done by Loggerhead?