Not sure either. LinkedIn is really picky with some of their settings and they change how things work, without much notice, here and there. It's very reminiscent of Facebook early on with their API. Fortunately, Facebook and even LinkedIn are much more 'stable' than they used to be.
I'm glad it's working for you now. The suggestions above are definitely what you *should* be using, so even if the other sites work, it's best to perform the same changes to their settings if they don't have all URL variations or aren't using a comma-separated list.
Of course, if you run into anything else or need more assistance, just let me know.
Thanks,
Alex