I think Paula's right....
Or maybe they are flooded? I would stick a corner of a paper napkin into your atty, so it makes contact with the bridge, and let it sit for a few hours. This will help soak up any excess liquid in the atty. Then, you can prime it with a couple drops, and go from there. This almost always gets my atties back on track.
If you cant get them to work, I would be happy to replace them.