@icanbeyourmuse I can think of half a dozen reasons why someone might ICly try to stop someone else from doing something. Maybe it was dangerous and your character wasn't equipped/skilled/prepped for it and the other person was concerned. Maybe they have a secret IC agenda that leads them to want you not to do it. Stopping someone ICly can be entirely in character, and if there's a conflict, it's probably best to work it out OOCly rather than assuming the other person is just a dick.
@Arkandel I think it's important when running PRP (which I've done a little of and look forward to doing more of) that the GM remember that they may not know everything that's going on with the player characters in the scene, too. Speaking for my own alt, who I think is involved in the one you're running, it's just really bad timing right now. She watched her fiance die horribly like two weeks ago ICly, and she happens to be a Composure 5 cool customer, so she's going to be generally far more low-key about anything that isn't immediately threatening her life. I've been hoping to loop some of the vassal PCs in to give them more to do, because I think that's important for characters in a higher ranking noble house to do when they can, but so far it hasn't shaken out much. (I'll keep trying, but I have a business trip coming up that's going to nuke my availability.) I am very sorry if you feel as though it's not going well, though!