I am test driving SCM version 1.2.0 HF2 and noticed that the 'Who made the change' shows "The 'who' value is not avaialble because 'who made the change' detection was disabled".
It is enabled under the settings.
Any ideas before I open a ticket?
Make sure you have the Who made the change detection turned on for that agent.
"Who" detection only works for files and registry data.
See these posts for more info:
Server Configuration Manager 1.1 is Now Available! Who Made the Change?
Monitor who made server configuration changes
Once you take a look at those, post pictures back here if you are still having problems.