Same issue here. Bought 2 MyBook World Edition II, whitelights.
Took some effort to overcome the first line support at WD, but then got through to a very knowledgable guy to whom I explained what I found here (fixing it with a, same version, firmware upgrade). So through a remotecontrol session he uploaded the firmware file and a manual firmware update fixed it after that.
Just did my second drive as well, works now.
So if you don't want to exercise some unix skills, push support and have them fix it this way.
If it doesn't work, let me know, I still have the firmware image (v01.02.06).
(PS. he mentioned immediately that it was an issue that needed fixing and he would report this, so I would expect this to be fixed with a future update)