When trying to Add Project and select World Community Grid, enter my username and password I get this error:

Failed to add project
Messages from server:
missing or bad parameter: email_addr

Workaround

This seems to be a regression bug from way back. For some reason the World Community Grid forum does not rank high in Google search results but in this thread I found the following workaround to add project from command line instead of GUI.

Do this:

1. Login to worldcommunitygrid.org then click Settings and My Profile, at the bottom of that page you will find your Account key
2. Have BOINC running
3. Open a Windows Command Prompt and go to the BOINC program directory, for 64-bit this should be something like c:\Program Files\BOINC, for 32-bit c:\Program Files (x86)\BOINC
4. Enter command:
   [code]boinccmd.exe –project_attach www.worldcommunitygrid.org [Insert your Account key here][/code]
5. That’s it, World Community Grid should now be added as a project in BOINC