Unfortunately, it seems that the it broke the iOS client, Akepa . I'm sure other clients are also affected.
They've been telling client developers that they should move from screen-scraping to using the API (https://github.com/HackerNews/API) for a while now. I don't know if that's the problem with this specific client, but you may want to check with the developers and see if it is, and if so, what their ETA is for getting onto the API.