When creating a project if you get the error "Project Creation Failed" or are trying to add a license to a project and get the error "License Linking Failed" then you need to log out of the site then log back in.
If these errors are shown then your session has timed out or expired on DriverCentral and logging back in will refresh the session and allow modification of customer projects.
This problem most often occurs if the IP address of your connection changes after logging into the site or if you are idle on the site for an extended period.