I've spoken to a lot of people and seen a lot of discussion about this issue. Seemed to occur sometime around 6-9PM PST on Mar 31, 2011. Almost every PVA being used to create an app will be treated as if it's not a PVA, and as such FB will request that you confirm the account with mobile or CC.
Has anyone done some testing? I know one person who has found that aged PVAs still work, while some have found that not to be the case. So results are mixed at this point.
Do you guys feel this is a temporary bug? It might be something targeting the methods PVA providers are using, or even the numbers they are using (i.e. from a specific country, or service).