Railworks America

Has anyone played this in TS2012 and succeeded? I got about halfway to Monument, and then a popup about an AI collision (apparently with the train ahead and another unspecified train). Scenario has not been tampered with in any way, and no save/reload been done previously.

I have had the exact same problem even before RW2012 was released. There was even an update to correct that. It did not do the trick.