blkwd74105.
I saw this statement a while ago (probably half yr ago) in the Revalidation Visa page under the Dept of State website. Not exactly sure if there's any update now. Also, my lawyer told me the same thing 2 months ago when I was about to getthe materials ready to apply for the stamp in Malaysia US embassy. She said this was probably any reason out of others. However, when I was trying to applied for visa stamp extension in Oct 2002, this statement was never mentioned in Dept of State website.
I couldn't tell u if this is the only reason since my 221 (g) stated my visa is not clearly approved at this time, and I need to apply at home country US embassy.
Hope this helps.