We are once again having extended downtime with the seed nodes. Repo was updated with Robert's seeds some time back, but v0.3.0 release doesn't include it so there could be initial connection issues.
We will also be testing alternative hosting providers to improve the availability of seed nodes. The availability of seed nodes should improve with v0.4 release as we start running seed nodes on two different hosting providers, as well as Robert's seed node. For now please include the above addnodes and see if it works.