Do I need my diploma and transcripts certified by my embassy to obtain a non-B visa in Thailand?

Went Nakhon Pathom immigration to change from a 30-day exemption + 30-day extension to a non-b and was told my diploma and transcripts must be certified by my embassy. The U.S. embassy would not certify them but had me sign an affidavit attesting that I had graduated on dates indicated. Took the affidavit and originals to Ministry of Foreign Affairs office in Chaengwattana, submitted them and awaiting results.

Anybody heard of this before? There were plenty of people in line at the MoFA certification office.