The project is wanting us, at our convenience, to detach and reload under the new URL. If you just hit the button, you'll lose your current WU, so you might want to wait until it finishes one, go to the Project page of the BOINC Manager and do an Update to be sure you get credit for that last WU.

When I Detached from the project, it did that but the BOINC manager hung up and had to be manually killed. Whoops!

Anyway, to reattach, enter the project URL as

http://www.cosmologyathome.org/

enter your email and password & away you go.

There's a note to this effect on the Cosmos home page http://cosmos.astro.uiuc.edu/cosmohome/