Post six of the first thread linked where it is clearly mentioned.
Beginning April 1, 2011, the U.S. Department of State will require the full names of the applicant’s parent(s) to be listed on all certified birth certificates to be considered as primary evidence of U.S. citizenship for all passport applicants, regardless of age. Certified birth certificates missing this information will not be acceptable as evidence of citizenship. This will not affect applications already in-process that have been submitted or accepted before the effective date.
In addition to this requirement, certified copies of birth certificates must also include the following information to be considered acceptable primary evidence of U.S. citizenship:
Full name of the applicant
Date of birth
Place of birth
Raised, embossed, impressed or multicolored seal of issuing authority
Registrar’s signature
The date the certificate was filed with the registrar’s office (must be within one year)
As I said, it's not a big deal and that's probably why nobody commented on it.
Please, explain why this is such a huge issue? For most people who need a birth certificate, they will need to get a long form one instead of a short form one. It's inconvenient but it's not the end of the world.
Edited to add
Apparently the use of the terms short and long form is causing some confusion. By short form, I mean without the parents names, and by long form, with the parents name. Some areas call them wallet and full size, others call them other things. In no way was I implying that the size of the document mattered to the state department as long as all the required information was on it. If you happen to live in an area where the short form birth certificate has required information (both parents name, your full name, birth date, registrar signature, place of birth, appropriate seal) that should satisfy the state department requirements.
The number of people who are applying for a passport and can not present a birth certificate with the required information is estimated to be a tiny faction of the people applying (75,000 out of the 14 million who apply every year), which is why they have the questionnaire for those few people.
This also does hit some US citizens applying for passport renewals.
Why would that be? When you apply for a renewal your current passport serves as proof of citizenship. If there are people who need to present a birth certificate at time of renewal, that's also a miniscule amount of people.