I assume you have enough licenses for everything running.
Go into Manager and check the licenses to make sure they show up as valid. If they do not show valid, reboot the IP Office and check again. Once they show up as valid you can go to the machine running Delta Server. Restart the Delta Server service. The licenses in Delta Server should show the same quantity of licenses you have in manager. If you are also running CCC, restart Reporter.
Finally, start Wall Board Server and you should be good to go!
Bob