So I contacted interfolio yesterday since a LOR and matching form mailed out from them on 7/27/11 still has not posted to my AADSAS application. They told me that it appears my LOR is not signed and this could be preventing AADSAS from posting it to my account and I should contact AADSAS to check. Has anyone else heard of this ever being a problem? I just assumed the professor uploads a word document to interfolio meaning that physically signing it would not be possible.