I'm not sure if it's been mentioned in other threads, and I'm also not sure if it's the case, but I remember that you're not supposed to be able to ask Captain Broderick about taking you to the Silent Isle until after you talked to Silas, but now I can. Also, right around the corner I think we're not supposed to be able to interact with those rocks until after we get the quest from Kohlmeier, but somehow I can.