Hi,
I look at the code of the game and, in order to decide to go to Turin, you should:
- Have received the second telegram
- Have visited Rovelli's place
- Have the recomposed letter with you
- Have examined the iron's gate at Raligotto's villa
For the moment, I do not see the bug, yet. The moment where you examine the gate should not count. If you examine the recomposed letter, you should get a slightly longer message, with a part that says that you recognize the symbol. This does not trigger any particular event though.
If you still think there's a bug, can you send me a save file of the game, so that I can watch it in more detail? Write me using the address on my blog, I will give you a second address where you can send attached files.
Cheers,
D.