Probably the best free method of doing this is to use the LOGFILEMODE System Variable as shown below and compare the two log files created.
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Command: logfilemode
Enter new value for LOGFILEMODE <1>: 0
[ AutoCAD - Thu Mar 12 10:53:52 2009 ]----------------------------------------
Command: setvar
Enter variable name or [?] <LOGFILEMODE>: ?
Enter variable(s) to list <*>:
<hit enter a few times and view all the variables>
Command: logfilemode
Enter new value for LOGFILEMODE <0>: 1
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