Avalanche Logs for:
Windows server 2003/2008: C:\Documents and Settings\All Users\Application Data\Spirent\Avalanche 4.xx\logs
WindowsXP: C:\Program Files (x86)\Spirent Communications\Spirent TestCenter x.xx\Layer 4-7 Application\logs WINDOWS 7: C:\ProgramData\Spirent\Avalanche 4.xx\logs