One of the main reasons I purchased the WD My Passport was for the integrated automatic backup solution. Boy, was I snookered.
I upgraded last night to the latest version of SmartWare 1.5.4.5. It took a while to install, but happened without complications. The software then took over 12 hours to categorize and backup 3.5 Gbytes of data. Not exactly the performance I was looking for. I then looked up information on this forum for version 1.5.1.6 and determined that the problem is systemic and not likely to be fixed anytime soon.
The solution I have found that works perfect for me is Synchronicity available from sourceforge at sourceforge.net/projects/synchronicity. It allows me to backup entire directories, then subsequent backups will only copy the files that changed. The software is free and very straightforward to use. I love the My Passport drive, and this allows me to use it effectively.