Donner Pass scenario still broken?

I purchased Donner Pass when it first came out and gave up on it after two attempts (or around 3 hrs) to complete the first scenario. Thinking that something might have changed since the upgrade to 2013 I gave it another try. Same result; an impasse leaving Emigrant gap - all signals are at danger. There's another train waiting (SRRVU 04) and the way the switches are set we would meet on the same track. All that's needed is to change one switch but although it LOOKS like that's possible (the switch icon appears) you can't. Very frustrating - is there a way around this problem? I gather that there's an upgrade due for Donner Pass - will this problem be fixed?
Geoff
Geoff