Save&Restore Error When Trying To Create A Recovery Point

First, I have already created several recovery points using S&R on Windows Vista, SP1, but today, when I opened the program, it says that I have no recovery points on C:\ and need to create one, even though it lists all of my previous recovery points.

 

Secondly, when  I do attempt to create a new recovery point, I get this error message, "Snapshot Error 121", "Error E7B70005: Running job".

 

I have not done anything to my machine that would all of a sudden cause this error with S&R...at least not that I am aware of.