Maybe I missed something in the documentation (likely), or my lack of understanding. But if you have a field of type esriFieldTypeBlob and you have .useAMF = true, your query will fail. At least that's what happened to me. The value in the blob field was System.Byte[] according to REST, so that may be the culprit.
Has anyone experienced similar behavior or can provide insight?
I don't think that ArcGIS Server handles blobs well at all so why are you returning a blob field in your field list. You can just hide that field in the MXD.
