These are very fact intensive and complex matters, beyond the time and scope of this site. There's been a great deal of litigation nation wide with regards to these assignments, and many have been successful. However, you need to consult a real estate or foreclosure lawyer right away.
The opinion expressed by the attorney is for informational purposes only and not for the purpose of providing legal advice. You should contact your attorney to obtain advice with respect to any particular issue or problem. Use of and access to this web site or to the attorney's opinion does not create an attorney-client relationship between the questioner and the attorney.