Ok, double-click on the CrystalReports2013ProcessingServer. This will bring up the properties page. Scroll down and make sure that the "Maximum Concurrent Jobs" value is set to 0. If it isn't, change it to 0 then click on "Save & Close" to go back to the list of 5 server processes. Select that server again and stop it. After it has stopped, start it again. I generally don't recommend using the "Restart" option because I've found that manually stopping and the starting again is more reliable.
-Dell