i noted this on 1.6.0 as well:
05-17-2012 06:33 PM
After instaling WD SmartWare Version 1.6.0 I can no longer schedule sleep mode in power management for windows 7 pro 64 bit. I was able to on prior version. If i remove smartware i can schedule sleep mode or if i end the process WDBackup in task manager i can schedule sleep mode. I can manually set sleep mode but can’t schedule sleep mode. What can i do to fix this? i know it is the smartware causing the conflict and need resolution.
here is the link if you want to read the replies: http://community.wdc.com/t5/WD-Software/WD-SmartWare-Version-1-6-0/td-p/407978