Blueprint 2.0 Fubar

Anyone seen this one? Before you give an answer, just know that the Cache has already been cleared and verified, and these files have been deleted and re-downloaded from Steam.
Let me also add to that that I can use a copy of the Editor that I have backed-up from 9/16. But, if I try to copy that into the current Railworks folder, it throws the same exception.
Let me also add to that that I can use a copy of the Editor that I have backed-up from 9/16. But, if I try to copy that into the current Railworks folder, it throws the same exception.