OK, are you using RDP to access the resource machine? RDP is not a remote access tool we recommend, partly because it destroys the remote desktop once you disconnect the session, and this has a negative effect on certain aspects of BP like global mouse click and surface automation. I've not heard of it affecting AA before, but it might. If BP is saying 'cannot match any element' it must mean that 1) the element is really not there at that moment in time, or 2) the element is there but the selection of attributes in the application model are not a match.