Strange. I had the non working version installed and then installed the new 2.2.6 version and it worked again. The blue WD icon shows up in the menu bar.
Previously, in order to access the RAID Manager app itself, I had to navigate to the following place:
(Hard Drive Name)/Library/Application Support/Western Digital/WDDriveManager
I then made an alias to the Manager and moved the alias to my Applications folder.
