It's not necessary to create an other google project. The google project is just for one account to config the admin user in corebos the first time and the other users will inherit this setting.
Please, open the firebug console in your browser and check if when you click in "Authorize and Connect" this produce any error.
Sorry Peter, but for I can help you well I need to connect to your corebos and server to verify that you have the code and database update, verify you google project, verify the data you introduce, check the connection, ...
Remember that you have to do a git pull to update your code and after go to corebos Update module to load the last updates and after apply them.
For google integration you have to create one google project for each corebos installation, because the redirect url change.
Check this steps and if continuous with the error, try to contact with Joe and we try to connect to you installation resolve this problem.